Which of the following is considered an environmental stress?

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Environmental stress refers to external conditions that affect the physical and psychological state of an individual. Temperature is a prime example of an environmental stressor because it directly impacts the body and can influence overall well-being and performance. Extreme heat or cold can lead to health risks such as heat exhaustion, hypothermia, or heat stroke, affecting how a person functions.

In contrast, employer pressure and a colleague being absent from work pertain more to workplace stressors, and while they can create a stressful environment, they aren't classified as environmental stressors in the same way that temperature or other natural conditions are. Thus, temperature is the correct choice as it fits the definition of an environmental stress that affects individuals universally, regardless of their specific job roles or personal situations.