Part B:

Which detail from the text best supports your answer from part A?
A
"I wonder what it would be like to be her friend, but I am sure she has too many friends."

B
"I know, I know...you think she is friendly, but I am not so sure...what is her story?" Mackenzie mused.

C
"I really feel like you are being silly," Jennifer said... "you should approach her and try talking to her... We should be nice to her."

D
...Mackenzie realized that she had misread Amber's situation entirely. While Mackenzie assumed that Amber had many friends and was too snobby to be friends with her, Amber was, in fact, a simple and lovely person...

The best supporting detail for the answer in part A is option D. This detail explains that Mackenzie's assumption about Amber's situation was incorrect, as Amber was actually a "simple and lovely person" rather than someone with too many friends or being snobby.