Which kinesic indicator was most useful in determining if members of the audience are under stress?

One of the most useful kinesic indicators for determining if members of the audience are under stress is body language, particularly signs of discomfort such as crossed arms, fidgeting, or avoidance of eye contact. Additionally, facial expressions like furrowed brows or tight lips can signal anxiety or tension. Observing these cues can provide insight into the emotional state of the audience and help gauge their level of stress.