why does the poem "Chicago" use apostrophe

Question

what is apostrophe? the use of it in this poem shows what?
a. shows possession
b. reveals the speaker's anxiety
c. makes the poem confusing
d. gives the poem immediacy

i think its B or D

Answer 1

sorry, the subject is just "Literature"

Answer 2

It must be D.

http://carl-sandburg.com/chicago.htm

Answer 3

its not giving me any information to figure out this question

Answer 4

thanks.that's what i thought it'd be