Final answer:
Cannabis/marijuana (D) is the most likely of the options given to cause amotivational syndrome, characterized by apathy and lack of motivation.
Step-by-step explanation:
Amotivational syndrome is often associated with chronic users of certain psychoactive drugs and may present as a lack of motivation, general apathy, or a decline in productivity. Of the options provided, cannabis/marijuana (D) is the drug most often linked to causing amotivational syndrome. Cocaine is a central nervous stimulant and is less likely to cause amotivational syndrome, as it increases alertness and wakefulness. LSD is a hallucinogenic drug known for altering sensory perceptions rather than causing amotivational syndrome. Ibuprofen is a nonsteroidal anti-inflammatory drug and does not cause amotivational syndrome. Understanding drug addiction and the compulsive use of a substance is important for recognizing and addressing the negative consequences associated with substance abuse.