A distant relative of hers, called Day, was going to Balaclava on business, and they agreed to launch a firm called Seacole and Day, which would be a general store and hotel near the British camp in the Crimea. So, at the age of 50, with her large stock of medicines, Mary went to the battle zone as a sutler – a person who follows the army and sells provisions to the troops. The moment she arrived in Balaclava there were sick and wounded to attend to. She opened her British Hotel in the summer of 1855, near the besieged city of Sevastopol. Hence, Option A is correct. Seacole Enterprises is a Mary; and based company. Seacole Stay House in Luton, England. Seacole Hotels are located near Mary Seacole's bust. All these are constructed after her death, hence, incorrect. 

David Lloyd George was a British Liberal Statesman who served as the Prime Minister of England between 1916 and 1022.  Hence, Option A is correct. The rest of the years fall within his tenure, not the date of taking of office, hence incorrect. 

Born into an English Quaker family that played an important role in the Industrial Revolution, Darby developed a method of producing pig iron in a blast furnace fuelled by coke rather than charcoal. This was a major step forward in the production of iron as a raw material for the Industrial Revolution. Hence, Option A is correct. The rest of the industries were revolutionised only after the iron-making industry developed, hence, these are incorrect.