Which Statement BEST Reflects the Relationship Between Serotonin and Suicide

Which statement BEST reflects the relationship between serotonin and suicide?

A) Low levels of serotonin are related to high levels of aggression and impulsivity.
B) High levels of serotonin are related to high levels of aggression and impulsivity.
C) Serotonin makes people more likely to abuse substances, increasing the likelihood of their committing suicide.
D) Suicide attempts increase the level of serotonin in the brain, making suicide more likely.