Final answer:
The correct answer to the question is C. is the best predictor of later drug abuse.
Step-by-step explanation:
The correct answer to the question is C. is the best predictor of later drug abuse. Drug use before the age of 18 is considered a strong predictor of later drug abuse. Research has shown that individuals who start using drugs at an early age are more likely to develop addiction problems later in life. Early drug use can have long-term negative effects on brain development and can increase the risk of substance abuse in adulthood.