Which of the Following Is NOT a Reason Why People

Which of the following is NOT a reason why people get addicted to psychoactive drugs?

A) People learn to associate the rewarding feelings of the drugs with the stimuli that are present when the drug is taken.
B) As the withdrawal symptoms increase,taking the drug to alleviate the symptoms becomes even more rewarding.
C) The low intelligence levels of drug users make them unable to force themselves off of the drug.
D) People who take drugs become more vulnerable to the rewarding feelings of drugs.