How does effective body language enhance impromptu speeches?

Effective body language enhances impromptu speeches because it conveys confidence and emphasizes the speaker's message. When a speaker uses appropriate gestures, posture, and facial expressions, it not only engages the audience but also reinforces the verbal message being delivered. Confident body language can create a sense of authority and connection, making the audience more receptive to the ideas presented. For example, open gestures can invite engagement and help clarify points, while maintaining good eye contact establishes trust and rapport with the audience.

The other options do not align with the positive role of body language in public speaking. Avoiding eye contact typically detracts from a speaker's credibility, and suggesting that body language is irrelevant ignores its vital role in enhancing communication. Additionally, if body language distracts from the key points, it undermines the effectiveness of the overall message rather than supporting it.