I notice that only one of the men has a mask on, I notice that they are both getting gas. I wonder where they are both going. I think this image is trying to say that there are two types of people, people who wear masks and people who don't.
Answer:
a) The twin brothers were Monsieur Marquis (Darnay's uncle) and his twin brother. The twin brother is Darnay's father.
b)The sick woman is a citizen of lower class who the nobles wanted. The woman had high fever. She kept repeating, "my husband, my father, my brother" and counted from one to twelve.
Hope this will help you!!
