C is not a response of stress.
The answer would be social environment. Claire of course lost the weight because of her hard work but the encouragement from her friends definitely helped motivate her.
Here are some discoveries:
1. Avastin (a drug) Smashed Records for Brain Cancer Treatment
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Hope it helps :)
D. <span>social activities, such as team sports, promote exercise. this is the only question in which it says why as in promoting exercise, the other answers do not specify</span>
