Which statement is NOT true of alcohol's role in causing aggression?

A) Alcohol reduces inhibitions.
B) Alcohol narrows a person's attention.
C) Alcohol decreases self-awareness.
D) Alcohol increases levels of serotonin in the brain.

Alcohol is known to decrease, not increase, levels of serotonin in the brain. Decreased serotonin levels are associated with mood regulation issues, which can contribute to aggression, contrary to the increase suggested in option D.