Answer:
(a) They were not sure how bad the damage to the CSM was
Step-by-step explanation:
You want to know the problem stated in the given excerpt from Countdown to Liftoff.
Topic
As in many essays, the first sentence sets the stage for the rest of the discussion. That is the case here. The problem is stated in the first sentence:
nobody knew exactly what the damage was to the CSM, choice A.