I believe the answer is C.
Diagnosing disorders early can help you to be able to make important decisions while there is still time. If you find a disorder too late, you won't be able to do much about it. The problem is that you don't have all the information, which increases difficulty to accurately diagnose which disorder, such as dementia and amnesia.
Answer:
The answer is Hands and arms
Headaches can be caused by exhaustion, dehydration, fevers, and other illnesses
