Final answer:
Jack's outburst and gesture in response to the good news is an example of emotions directly influencing behavior, demonstrating an immediate and spontaneous reaction to an emotional stimulus.
Step-by-step explanation:
Upon learning that his difficult proposal has been accepted, Jack's exclamation of 'Yahoo!' and physical gesture of thrusting his fisted arm into the air is an example of emotions directly influencing behavior. This spontaneous reaction was not based on a new perception or belief about the client, nor was it a predetermined behavioral intention. Instead, it was a natural, emotional response to positive news, demonstrating how feelings can immediately prompt actions. In this context, Jack's behavior wasn't dictated by prior cognitive processes (beliefs or perceptions) but by the immediate emotional impact of the situation.