Final answer:
Without detailed information on Experiment 2, it's challenging to determine which conclusion about the nature of audience support is justified; audience support, especially from friends, has been shown to lead to better performance under stress.
Step-by-step explanation:
The nature of audience support and its impact on performance is a complex subject that can vary depending on the context and the individuals involved. Based on the provided information, Experiment 2 specifically demonstrates that social support from a friend, who might not directly benefit from the performer's success, leads to better performance outcomes such as lower blood pressure during stressful tasks. Therefore, none of the options A through D directly correspond to the findings in Experiment 2. To accurately determine which conclusion is justified by the results of Experiment 2 alone, we would need more detailed information about the experiment's design and results. Unfortunately, without that information, it is difficult to provide a definitive answer to the question of what conclusion about the nature of audience support is justified by the results of Experiment 2 alone.