Answer:
The detail from the text that best supports the answer to Part A is “my sweet-voiced nursery-school tot replaced by a long-trousered, swaggering character who forgot to stop at the corner and wave good-bye to me.”
Explanation:
Part A asks about the personality of Laurie in the story "Charles" by Shirley Jackson, Lauries is a rude and bad behaved little boy and this lines describe how his mother sees that he has changed from the sweet little boy he used to be not so long ago, and now he does as he wishes and do not respect anybody.