The author includes the description of the revolutionaries in the streets in order to show Nina's courage and friendship.
Answer: Option D
Explanation:
The setting seems to be in a very dangerous place where a revolution is happening followed by protests. The protestors are against the government of United States of America. While the protest procession was passing by their house, Nina goes outside when the protestor yells that he and his group are not against the citizens of the United States of America but rather against its government only. Nina faced them fearlessly, which shows her courage.