Final answer:
Jennifer's feelings of frustration are a stress reaction.
Step-by-step explanation:
According to the information provided, the statement that is true is b) Jennifer's feelings of frustration are a stress reaction.
Stress is a response to our surroundings, and it can manifest in various ways, including physiological, cognitive, and behavioral responses. Jennifer's feelings of frustration in response to her car breaking down can be considered a stress reaction.