Why do addicts need great quantities of drugs over time? O They enjoy drugs more over time. O They generally have more money to spend on drugs. O They have to replace over-the-counter drugs with prescription drugs. Individuals build up a tolerance to drugs and need more to get the same results. A they enjoy drugs more over time b they usually generally have. more money to spend on drugs c they have to replace over the counter drugs with prescription drugs D individuals build up a tolerance to drugs and need more to get the same results