a correct sentense?

Hello,
I have a problem with answering a question in the TOEFL Exam.

According to a dialogue, a student is apparently given a chance to participate in a field trip. At the same time, however, she had before promised a professor to help out with setting up a museum exhibition.

Now she has to options:
1- Going to the professor, asking whether there might be some one to be substituted with her

2-To complete the exhibition work by the day of the trip.


I discuss one solution in two different tenses. Please let me know ALL the problems:

A: Suppose she did not manage to have the set up thing carried out by the day of the trip. It would? be as if she had chosen? the first option from the start?/at the first hand?

B: Suppose she couldn’t manage to have the set up thing carried out by the day of the trip. It will? be as if she chose? the first option from the start?/at the first hand?

Thank you in advance,
Lily