In Regards to Addictive Behaviors, What Does Relapse Mean? Relapse

In regards to addictive behaviors, what does relapse mean? Relapse means

A) the ability of a psychoactive drug to remove negative withdrawal symptoms.
B) the conflict between addictive behaviors and family, social demands, or work activities.
C) the resumption of drug use following a period of abstinence.
D) the ability to tolerate more and more drugs without ill effects.