Which of the following can inhibit reaction times?

Inhibiting reaction times generally relates to factors that can impair cognitive function or physical responsiveness. The factors listed in the correct choice encompass substances and states that are known to affect mental and physical performance.

Alcohol and certain drugs can depress the central nervous system, leading to slower reaction times and impaired judgment. This impairment can significantly affect one's ability to respond to stimuli effectively. Concentration and distraction also play a critical role; when a person's focus is divided or they are preoccupied with other thoughts, their reaction to external stimuli is often delayed.

Understanding how these influences work helps in recognizing why maintaining a clear state of mind and limiting alcohol or drug intake is essential for tasks that require quick reactions, such as driving or sports.

The other choices, while they may also influence reaction times in certain contexts, do not directly refer to common factors that inhibit reaction performance as strongly as the correct choice does.