Question

the amount of alcohol in the blood is referred to as:
implied consent (ic)
blood alcohol concentration (bac)
rate of alcohol consumption (rac)

Explanation:

The question is about the term for the amount of alcohol in the blood. "Implied consent (IC)" relates to legal consent for testing, not the amount. "Rate of alcohol consumption (RAC)" is about how fast alcohol is consumed, not its amount in blood. "Blood alcohol concentration (BAC)" directly measures the amount of alcohol in the blood.

Answer:

blood alcohol concentration (BAC)