Why Is It Unlikely That Damage in Specific Structures of the Brain

Why is it unlikely that damage in specific structures of the brain itself causes a psychological disorder?

A) because psychological disorders typically involve emotional, behavioural, and cognitive symptoms
B) because genetic factors exert an overriding influence on the development of most psychological disorders
C) because other parts of the brain will compensate for the damage
D) because environmental factors are the major factor in the development of most psychological disorders