The track coach notices that his star runner is running quicker than ever before, but quickly gets tired and shows evidence of depression after the race. the coach should suspect that the runner might be taking

The correct answer is - amphetamines.

Explanation:

Amphetamine is a synthetic stimulant that is mood-altering drug and illegally used for improving the performance by the athletes. It is only available with a prescription of a doctor to treat narcolepsy and ADD in children.  

This speeds the messages in between the brain and body of an individual. These drugs or stimulants have many side effects like fatigue, tiredness, and mood swings or depression.

Thus, the correct answer is - amphetamines.

answer; the national uniform billing committee(nubc);