Part A
The best inference to make based on what happens in “The White Umbrella” is:
1) The narrator feels she has betrayed her mother by telling Mrs. Crosman she wished she were her mother and accepting her gift.
Part B
The two details from the story that best support the inference in Part A are:
1) “I got out after them; and while everyone else was inspecting the damage we’d done, I threw the umbrella down a sewer.”
4) “Remembering what I had said to Miss Crosman, I tried to maneuver the umbrella under my leg so she wouldn’t feel it.”
These details illustrate the narrator's feelings of guilt and betrayal toward her mother, reinforcing the inference that she feels she has disappointed her mother by expressing a desire to be in another family dynamic and taking a gift that symbolizes different values.