Naturally Sourced Stimulant:

Out of the given options, only Cocaine is a naturally sourced stimulant.

Explanation:

Stimulants are drugs that increase alertness, attention, and energy. They stimulate the central nervous system and produce a sense of euphoria. Some of the commonly used stimulants such as caffeine, nicotine, and amphetamines are synthetic, while others such as cocaine, opium, and marijuana are naturally sourced.

Out of the given options, Morphine is an opioid pain medication that is derived from the opium poppy plant. It is not a stimulant but rather a depressant. Amphetamines are synthetic stimulants that are used to treat attention-deficit/hyperactivity disorder (ADHD), narcolepsy, and obesity. Marijuana is a psychoactive drug that is derived from the cannabis plant. It has both depressant and stimulant effects.

Cocaine, on the other hand, is a naturally occurring stimulant that is derived from the coca plant. It is a powerful stimulant that produces feelings of euphoria, increased energy, and heightened alertness. It acts on the central nervous system by increasing the levels of dopamine, a neurotransmitter that is associated with pleasure and reward.

In conclusion, cocaine is the only naturally sourced stimulant out of the given options. However, it is important to note that the use of cocaine can lead to addiction, physical and mental health problems, and even death. Therefore, its use should be strictly avoided.

Morphine...