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.
Conventions are a way something is done.
The rhetoric from this last line seems to be saying as a metaphor that in the eyes of men, the vicious tricks of the horse or mule in spite of being provided fodder are like women, who dare to challenge the authority of men so this is a metaphor for the attitude of men to women. She wants women to to have the same rights as men in other words to education, to meaningful work and to participate in politics alongside and as equal partners to men.
