Which of the following statements is true about bac?

a. the positive buzz from alcohol doesn't usually occur below a .06 bac.
b. increased drinking above a .06 bac can result in fatigue, slower breathing, reduced coordination, and a general "down feeling".
c. a bac above a .10 has many side effects, but it also increases the stimulant effect of alcohol.
d. bac can be significantly reduced by vigorous exercise.