Answer:
Aunt Agatha says that Gussie "has lost his head over a creature." These words reflect her feelings for Gussie that C: They show her disdain for Gussie's lack of self-control.
Explanation:
In the given line that Aunt Agatha says to Gussie, some words have been chosen specifically. It means that Gussie has lost self-control because of "a creature". For Aunt Agatha, creature is not important, so she is not happy with Gussie’s behaviour.
Thus, option C is the correct option that says they show disdain for Gussie’s lack of control. Option A and B are incorrect because this doesn’t show they are showing concern that Gussie is always buying pets or he is liking America. Option D is incorrect because they are not disapproving his sense of friendship.
