What effect do psychoactive drugs have on the body?

Psychoactive drugs primarily alter mood and perception, which is why this is the correct answer. These substances interact with the brain's neurotransmitters, leading to changes in how individuals experience emotions and perceive the world around them. They can enhance feelings of pleasure, anxiety, or depression and can also alter sensory perceptions, distorting reality.

For example, stimulants like amphetamines can create feelings of euphoria and increased energy, while depressants such as alcohol can lower inhibitions and induce feelings of relaxation. Hallucinogens, another category of psychoactive drugs, can cause significant changes in sensory perception, making common sights and sounds seem unusual or even unreal. Thus, the emphasis on altering mood and perception encompasses a wide range of effects that psychoactive drugs can have on individuals, capturing the essence of their capabilities.

While other options describe certain effects associated with specific substances, they do not encompass the broader effect of altering both mood and perception experienced widely among different categories of psychoactive drugs.