The reader can infer that Alexandra's attitude changes depending on the people she is spending time with. Which sentence from the text best supports this inference?

A.
"You had better change your attitude and realize that this will be fun!" her father asserted with somewhat forced enthusiasm.

B.
An unexpected smile took over her face as she saw the pigs, goats, and llamas at the petting zoo, just waiting with expectant faces.

C.
Without the thoughts of her friends disapproving of this "babyish" activity, Alexandra really allowed herself to have fun.

D.
She realized that her parents may have been right about the value of spending the day together.

C. Without the thoughts of her friends disapproving of this "babyish" activity, Alexandra really allowed herself to have fun.

C. "Without the thoughts of her friends disapproving of this "babyish" activity, Alexandra really allowed herself to have fun."

The sentence that best supports the inference that Alexandra's attitude changes depending on the people she is spending time with is option C.

The sentence "Without the thoughts of her friends disapproving of this 'babyish' activity, Alexandra really allowed herself to have fun" suggests that Alexandra alters her attitude based on the presence or absence of disapproval from her friends.