Answer:
The Narrator in "The White Umbrella."
Explanation:
"The White Umbrella" is a short story written by Gish Jen. The story is about a young girl, who is the narrator of the story also. She is obsessed with a white umbrella because her friends have a white umbrella. She asks her mother to buy one but could not afford to buy it.
She hates her mother for not able to buy her a white umbrella but at the end of the story, when the narrator, her sister Mona and their mother met with an accident, she realised that her mother and family is more important than any materialistic thing.
So, it is the narrator of the White Umbrella who has a sister named Mona. Thus, the correct answer is the first option.