Which of the following describes psychoactive drugs?

Psychoactive drugs are defined as substances that can alter an individual's mental state, affecting emotions, thoughts, and mood. This is achieved through their interaction with the brain's neurotransmitter systems, leading to changes in perception, consciousness, and behavior. These drugs can include a wide range of substances, from prescription medications to recreational drugs, which all have the potential to impact cognitive functions and emotional well-being.

Considering the nature of psychoactive drugs, it is clear that the definition encompasses their ability to modify psychological experiences, making the statement about altering body functions, including thoughts and mood, particularly relevant and accurate. This aligns with the wide-ranging effects these substances have on mental health and overall psychological experience.

The other options fail to accurately capture the essence of psychoactive drugs. Some drugs can indeed have serious effects on physical health, but this does not define them solely as psychoactive substances. Additionally, the notion that these drugs are only prescribed for adults is misleading, as many psychoactive medications can also be prescribed to minors under appropriate medical guidance. Lastly, claiming that psychoactive drugs have no impact on emotions contradicts their very definition, as these substances are specifically known for their capacity to influence emotional and psychological states.