I think the central idea is The people
The giant "Clothespin" that stands in front of Philadephia's City Hall expresses the B) capriciousness of its sculptor, Claes Oldenburg.
Aviary has to do with flying/birds, equitation with riding horses, and zoology with animals in general.
Answer: He needed a hiding place to stay, he didn't realize the danger was in so it took him a while to actually come, because he needed to put his priorities in order
Explanation:
Dussel came to live in the Secret Annex in November 1942 he would've came sooner, but didn't realize how much trouble he was in so he fixed all his affairs before coming.