What Is Meant by Opportunistic Interventions for Alcohol Problems

What is meant by opportunistic interventions for alcohol problems?

A) Advice and brief treatments given at primary care facilities to patients attending for injuries sustained while under the influence of alcohol.
B) Advice and brief treatments offered at presentations given at colleges and workplaces.
C) Advice and brief treatments offered to individuals who appear to have alcohol problems, given by college tutors, workplace managers and staff at leisure facilities.
D) Advice and brief treatments given at primary care facilities to patients attending for reasons unconnected with alcohol consumption.