The passage does not seem to indicate that the greenhouse roof is designed to allow the entry of sunlight into the greenhouse to help plants grow. While there is evidence for options A and C, could someone please clarify how B is correct in this case? Does it require us to use outside knowledge?
there are plants. It’s a greenhouse with sunlight allowed in as part of the design. It would be silly if B wasn’t correct.
I would call this obvious common sense, not outside knowledge. Obvious common sense = correct.