Renewable resources are the resources which can be replenishment. Like sunlight, rainwater. The use of renewable resources favours the sustainable development. As sustainable development focuses on the meeting the need of present without hampering the future generation.

The World Summit on Sustainable Development (WSSD) was held in Johannesburg, South Africa, from 26 August to 4 September 2002. 

Recycling is an important part of a sustainability. It helps to preserve the resources available in the society and to reduce the impact of processing these resources on the planet. As a result, human health improves due to fewer pollutants and ecological balance is maintained. This leads to a development without compromising the needs of the future generation. Thus the correct answer is option A.

The resources are the substances which can be harnessed for the production of energy. The value of the resource depends on the quantity and the quality. The quantity describes the amount of the resource which is present on the Earth and available for use. The quality is the form in which the resource can is present and needs to be transformed so that it can be used. The metals are obtained as ores and should be purified to pure quality for use. The value depends on the type and the need of society. When there is more population residing in a society, the requirement will be more and the value of the resource will increase. 

Conservation is the process in which the resources are used in a sustainable manner without affecting the environment. When the energy resources are conserved, this will reduce the emissions of harmful pollutants and cause less pollution. The cost required for the treatment of the polluted resources will be reduced. Also, the cost required for the production of new resources for energy will be reduced. The conservation and proper use of the energy will lead to protection of the resources for the future generation. 

Sustainable development means that the kind of development that meets the need of the present without compromising the ability of the future generation to meet their own needs. By reducing excessive use of natural resources, sustainable development can be achieved. 

• Sustainable development (SD) caters to the need of present generation without affecting future resources.
• It is a process for meeting human development goals while maintaining the ability of natural systems to continue to provide the natural resources and ecosystem services upon which the economy and society depend on.
• It allows the creation of new facilities, the use of renewable resources and more production. 
  
  

Sustainable development is a process of meeting the need of the present generation without posing any threat to resources for the future. According to this concept, more emphasis should be given on recycling (It is a process to convert waste materials into reusable material to prevent waste of potentially useful materials, reduce the consumption of fresh raw materials, reduce energy usage, reduce pollution levels). 

By taking these small steps, we can help preserve our Earth's natural beauty. Thus all of the above is the right answer.

Sustainable development is a concept which talks about kind of development which does not bring any harm to the environment, also it is beneficial /acceptable to all stakeholders sustainable development means meeting the needs of the present without compromising the needs of the future. For example - solar Energy, crop rotation. 

Electricity is one of the primary needs of human society. Electricity is crucial in human life to remove poverty, economic growth, and improved lifestyles. Even low voltage electricity make much difference in the remote areas. Village areas where there is no electricity are facing many difficulties after natural light i.e. when there is no sunlight. They are unable to do their works at home and cannot move in the streets if there are any emergencies like major health issues

About $1-5\%$ of incident solar energy or $2-10\%$ of PAR is captured by the photosynthetic organisms for the synthesis of organic matter(Gross primary productivity). Roughly $20\%$ of it is consumed in respiration so that net capture of energy(net primary productivity) is $0.8-4\%$ of incident radiation or $1.6-8\%$ of PAR.