Answer :
The author choose to use drawings and diagrams in City because B. City plans and buildings are physical things that can be better understood if they are seen
The answer is B. Think about it, it can't be A because it has nothing to do with the question; it can't be C. because we can't determine if he in fact is a better drawer; and it can't be D. because the target audience is not mentioned or known.
Hope I helped :)
Hope I helped :)