Answer: b. She used to wear pretty clothes and be lively-when she was Minnie Foster, one of the town girls, singing in the choir.
Explanation: In this sentence (and several other remarks) we learn something that is, plot-wise, very important about Mrs. Wright's past: she used to have a liveliness in her youth (before marrying) that is now gone and at some point in the last 20 years, she has stopped wearing pretty clothes.
To avoid jealousy, Maria, Carlos, and Juan swore to be friends forever, and it’s still true today
He wishes he had a better more exciting life.
Throughout the story, Walter Mitty daydreams that he is doing something more exciting than his actual life. He imagines piloting a hydroplane, performing a difficult operation, giving testimony as an accused murderer, and an RAF bomber pilot. Simple everyday tasks in his real life trigger these day dreams into a more exciting and adrenaline producing adventure.