Responding to both multiple stimuli and response possibilities have been shown to be affected by blood alcohol concentration of as low as .04. this is called

Answer – Choice or complex reaction time

Blood alcohol concentration of as low as .04 can significantly affect general alertness, such that a person’s ability to respond to both multiple stimuli and response possibilities have been shown to be affected when the choice reaction time (also called complex reaction time) is tested.

A. vitamin c is your answer