Final answer:
The inapplicable question for an athletic trainer to investigate when completing a progress evaluation is whether there are any new developments in the athlete’s family life.
Step-by-step explanation:
The inapplicable question for an athletic trainer to investigate when completing a progress evaluation would be:
c) "Can you describe any new developments in the athlete’s family life?"
While it is important for an athletic trainer to gather information about an athlete's medical history, training adherence, and dietary plan, changes in the athlete's family life do not directly impact their physical health or performance.