What is the MAIN IDEA in the article "Fight or Flight- The Evolution of Stress"?

A.
Tigers are dangerous and people should never try to fight them.
B.
People should avoid dangerous or problematic situations in order to reduce stress.
C.
When a person is in danger or under stress, their body has an automated response to help ensure survival.
D.
People should avoid talking to their bosses because it can be stressful.

C. When a person is in danger or under stress, their body has an automated response to help ensure survival.