Answer:
a. brain tumors
Step-by-step explanation:
a. A brain tumor is a collection, or mass, of abnormal cells in your brain. Your skull, which encloses your brain, is very rigid. Any growth inside such a restricted space can cause problems. Brain tumors can be cancerous (malignant) or noncancerous (benign).
b. Drugs can cause addiction
c. alcohol can block chemical signals between brain cells
d. if you are talking about childhood trauma, then yes that can cause a mental disorder, most likely depression.
The answer is A. Brain tumors.
Hope this helps!