What is NOT affected by stress according to specified categories?

The correct answer identifies the social category as the one not directly affected by stress in the context provided. Stress typically impacts physiological, behavioral, and mental aspects significantly. Physiologically, the body undergoes various reactions to stress, such as increased heart rate and hormone release. Behaviorally, individuals might display changes such as irritability or withdrawal from social interactions when under stress. Mentally, stress can lead to impaired cognitive function, anxiety, or mood changes.

In contrast, while one's social environment can influence stress levels, the actual social relationships themselves aren't directly altered by stress. Instead, stress might affect how an individual interacts socially or how they perceive their social networks rather than altering the fundamental social category itself. Therefore, social interactions might be influenced by stress but are not themselves a category that stress uniformly impacts.