Which of the following describes the nature of emotion as expressed through tone of voice and demeanor?

The correct answer is "Affect," which refers to the observable expression of a person's emotional state. It encompasses the way emotions are conveyed through non-verbal cues, such as tone of voice, facial expressions, and body language. When a person is expressing emotions, their affect is what others perceive in their demeanor and vocal tones, helping to communicate feelings like happiness, sadness, anger, or excitement.

The other options, while related to emotions, do not specifically describe the outward expression of feelings. "Judgment" pertains to the cognitive assessment of situations or behaviors, and "insight" refers to the awareness and understanding of internal thoughts or emotions. "Mood," on the other hand, relates to a more sustained emotional state rather than the immediate expression of emotions through behavior and voice. Thus, "Affect" is the term that best captures the concept of emotion as it is reflected in one's tone and demeanor.