Answer:
B.Immune Response
Explanation: The immune system is the body's defense and response system to disease and illness.
It takes resources when there are more animals it takes more food then when you run out of food you will have to buy more which you will run out of money its all about money without money animals will starve.
Your answer is takes resources.
Depending on the person, many different things could work like meditation, talking to friends, maybe having some tea, taking a shower, going for a drive, having some comfort food, and so many other things that allow you to release endorphins and relax your brain. : D