How is Mike’s point of view affected by his grandmother’s greeting? (Paragraphs 17-24)

A
Mike realizes how lonely his grandmother has been.
B
Mike realizes that something is off in his grandmother’s behavior.
C
Mike begins to think that his grandmother does not love him anymore.
D
Mike begins to think the nursing home staff are abusing his grandmother.

This is from the article The moustache from commonlit I need help?