I believe the correct answer would be that shes implying The other shouldn't have done that; it was rude.<span />
One technique would be to annotate as you read.<span />
I would say the correct answer is girls had laughed a little nervously.
Based on this clause, we can deduce something about their personality, and that is that they are happy kids who want to laugh all the time but they are not allowed to. The other options are either direct characterization or not characterization at all.
D. If it's too hard to read, then you should shorten some sentences to give the sentence more of a flow.
