Final answer:
Zachary is most likely experiencing the effects of cocaine, a stimulant drug that causes increased heart rate, pupil dilation, diminished appetite, and euphoria. So the correct answer is option (A).
Step-by-step explanation:
Zachary is most likely experiencing the effects of cocaine. The psychoactive drug cocaine is known for its stimulant properties and is readily identified by its ability to cause an increased heart rate, dilated pupils, diminished appetite, feelings of self-confidence, and euphoria. These symptoms align with the immediate effects felt after cocaine ingestion, reflecting its classification as a potent stimulant.
Recreational use of such psychoactive substances is often associated with a "high" but can also lead to addiction, dependence, and the need for rehabilitation. Furthermore, repeated consumption can disrupt normal brain functioning, leading to a range of adverse consequences, such as mood dysphoria and cognitive problems.
Cocaine's intense effects contrast with those of other drugs, such as marijuana, which typically produces relaxation and appetite stimulation; heroin and other opiates, which usually lead to sedation and a sense of well-being; and the more varied effects of hallucinogens.