It's C.) Adolescence ^-^
The Answer is C. Adolescence Reason Being After Your Childhood Stage You Learn How To Adapt in the Real World and Finally Learn How To Become An Adult
Answer:
I believe the answer is B.
B)mental/emotional pain
Explanation:
It's really all in his head because he is stressed and it can cause pain or in his case pain to his stomach
Strong selection for change is acting on this gene.