Direct eye contact is most likely to increase your connection with your audience and help you control nervousness. Hence, option C is correct.
the feeling of being slightly alarmed or worried: Concern about what the future may contain is present.
Her job interview is making her anxious. I'm becoming anxious after waiting all this time. He looked at the time anxiously. His anxious mother often worries that he'll suffer a tragic fate.
An individual's response to stress is unique, and it has an internal source. A "persistent feeling of dread or concern" in circumstances that are not genuinely dangerous is a common feature of anxiety. In contrast to stress, anxiety lingers even after a worry has subsided.
Thus, option C is correct.
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