Final answer:
Emotions are brief, intense responses to specific events, unlike moods which are prolonged, less intense states not tied to specific triggers.
Step-by-step explanation:
The true statement about emotions among the options provided is: a. Emotions are triggered by specific events and are brief but intense. This is because emotions are commonly understood as a subjective, affective state that is generally intense and arises in response to something a person experiences. Emotions can be conscious experiences, accompanied by physiological changes and are often brief. For example, the intense feeling of fear during a startling event like the Boston Marathon bombing is an emotional response. Moods, meanwhile, are longer, less intense affective states that may not be intentional or even consciously recognized.
Contrary to options b, c, and d, emotions are not necessarily lengthy or unrelated to specific events, are not inherently unprofessional in the workplace, and positive emotions do not inherently destroy organizations. In fact, emotions play a critical role in memory formation and the appraisal of situations, which can be positive and constructive for organizations.