Answer:
c
Explanation:
The paragraph said"but i wish they would add some more..."
who is they?
if we try to look at the previous sentence, they can only be inferred to the trees, of course the narrator doesn't wish that the trees would add playing fields and more sport team and if we try to guess, maybe he is talking about the president, the manager, or maybe the government.
So we need to specify who they is. C answers that problem by replacing they with "the park department", clearing any confusion.
