"en" should be the answer
What special event is Ximena preparing for?
What does Carmen say Ximena should do before using the dryer?
Whose dress is Ximena going to wear?
Based on what Carmen says, do you think she prefers to wear pants or an elegant dress? Why do you think that?
If your looking for the answer to be either hablarías/hablaría it is hablaría.
I believe it is seria because una estudiante is feminine not masculine
Claudia y Nicole ayudan a María a mudarse.
You would use the ellos/ellas conjugation of ayudar because there are two people completing the verb.