Which example demonstrates assent through vocal expressions?

The correct answer illustrates assent through vocal expressions by capturing an affirmative response that suggests agreement or willingness. When an individual says phrases like "okay" or exhibits enthusiasm, it reflects a positive, verbal acknowledgment of the situation at hand. This form of vocal expression is a clear indication that the person is consenting, engaged, or in favor of what is being proposed or discussed.

In contexts concerning behavior assessment or therapy, vocal expressions such as affirmations or signs of enthusiasm are vital as they communicate the individual's feelings and preferences. This kind of feedback is essential for practitioners to gauge the individual's readiness or agreement in various scenarios, thereby fostering a more collaborative and responsive environment.

Other options represent non-vocal behaviors that signal avoidance or disagreement, which do not indicate assent or acceptance. These actions detract from understanding the individual's willingness or agreement in a given situation.