Most of the time when you write, you first write your topic sentence or main idea, and then; A. write whatever you want
B. you are finished
C. distract with other details
D. continue with elaboration

allusion   is the right answer

it is the background information on the characters and setting explained at the beginning of the story. the exposition will often have information about events that happened before the story began. the exposition is often the very first part of the plot.

i think she wanted to protect her children from the extreme racism of the american south.