Jenna is a talented singer. Her singing is commendable when she is well re-hearsed and is performing with her school choir group. In such situations, she is moderately aroused and fairly relaxed. However, when Jenna's friends are around, she gets overly aroused and anxious. In such situations, she finds it hard to focus and often makes mistakes. Which of the following psychological principles can be used to explain the rationale behind Jenna's performance?
a) the Cannon-Bard theory.
b) the Yerkes-Dodson law.
c) the James-Lange theory.
d) self-regulation.

Yerkes-Dodson law is the concept that determines about performance is directly related with arousal.Increment experience in arousal can tend to upraise performance till a certain level and then decrease .

According to the question, Yerkes-Dodson law is working in situation of Jenna as she performs well when there is certain arousal through presence choir group and rehearsal but then arousal tends to diminish her performance and makes her anxious at a certain point due to presence of friends.

Other options are incorrect because self-regulation, Cannon-Bard theory and James-Lange theory are not the concept depicted through Jenna's performance.Thus, the correct option is option(b).