What should you do if a dog is about to get hit by a car?

Which of the following identifies the main culprit for america’s increasing weight gain?

Choose thyroid, parathyroid, or the adrenal gland and choose one disease affecting this part of the en-docrine system.

What should be changed to make the following sentence true? "the stress model suggests that people with a predisposition for a disorder are more likely to develop the disorder when faced with stress."