Answer:
Adequate, enough
Explanation:
Supynonyms mean the words mean the same thing
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.
A larger-than-life charecter, funny solutions to problems, and Exaggerated details.