Options for the question have not been provided. They are as follows:
goal-setter
self-monitor
support system
nutritionist
Answer:
support system
Step-by-step explanation:
A support system helps the person to achieve their goals. It motivates them and creates a facilitating environment for them.
Here, Kara has started a new exercise regime. Her sister is motivating her by working out with her. She also shares her progress with her so that Kara realizes that she is not alone in this program. Due to the efforts of her sister, Kara will feel more enthusiastic towards the regime and chances of her quitting it will be low. Hence, Kara's sister plays the role of support system here.