Explanation:

• The statement is about drugs most commonly chosen by juveniles who test positive for drug abuse.

• Option 1: Heroin is a highly addictive opioid, but less popular among juveniles compared to other drugs due to its high intensity and serious consequences.

• Option 2: Amphetamine is a stimulant, but generally not the first choice for juveniles.

• Option 3: Cocaine is another stimulant, yet due to its cost and effects, it isn't as commonly chosen by younger individuals.

• Option 4: Cannabis is often the drug of choice for juveniles due to its accessibility and social acceptance.

• Option 5: Ecstasy, a party drug, is sometimes chosen by youth but not as frequently as cannabis.