Erin's boyfriend has taken her out to dinner at a very exclusive restaurant. Erin notices that he can't seem to sit still during the meal, and is constantly rubbing his left knee, scratching an itch, or pulling his earlobe. This type of body language usually indicates .

emotional arousal                                  

Explanation:

Emotional arousal: In psychology, the term emotional arousal is determined as an individual experiencing a specific state of "heightened physiological activity". While experiencing an emotional arousal, an individual feels strong emotions, for example, fear, anger, etc and therefore a person goes to the state of emotional arousal because of his or her day-to-day life experiences.

Examples of emotional arousal may include "freeze, flight, or fight response".

In the question above, the given type of body language usually indicates emotional arousal.

answer; the president uses mass media to gain support for policies;