To answer this question, you need to understand the difference between the words "stationery" and "stationary."
Option A) stationery, stationary - This option is correct because "stationery" refers to writing materials and office supplies, while "stationary" means not moving or still. In the given sentence, Daniel couldn't locate the stationery shop because the stationary van blocked the board from view. The correct use of "stationery" (writing materials) and "stationary" (not moving) fits the context of the sentence.
Option B) stationary, stationery - This option is incorrect because it uses "stationary" (not moving) to describe the shop, which doesn't make sense in the given context. Additionally, it uses "stationery" to describe the van, which is incorrect.
Option C) stationary, stationary - This option is incorrect because it uses "stationary" (not moving) to describe both the shop and the van, which doesn't make sense in the given context. It should be "stationery" to describe the shop.
Option D) stationery, stationery - This option is incorrect because it uses "stationery" to describe both the shop and the van, which doesn't make sense in the given context. It should be "stationary" to describe the van.
Therefore, the correct answer is A) stationery, stationary.