When Elliot's mother asked Elliot if he noticed a change in Mrs. Sen's behavior, what did he say?
a. He said that he hadn't noticed any change.
b. He said that he had noticed her acting more distant and withdrawn.
c. He said that he had noticed her being more talkative and cheerful.
d. He said that he hadn't paid enough attention to Mrs. Sen's behavior to notice any change.
