Answer:
"Is it cheaper if I pump it myself"
The poem is about a series of pictures and it is describing the pictures and all the details they entail.
The answer is not A, because it is not clear enough. Who's we?
The answer is not B, the sentence is not clear about the building they are visiting.
The answer is not C, it's not clear about what building they are talking about.
So your answer is D.
The first one is the goat
The second is shark
The answer is either A or C, but I would choose A.