The Article states:
Doing good increases serotonin. That's a chemical in our bodies that can help heal wounds and make people feel happy. The same goes for endorphins, the brain's natural painkiller. In addition, studies have shown that people who act kindly live longer. They have more energy. They also experience less stress and depression.

Why did the author include this passage?

A To describe ways that stress can cause a person to become more unhappy
B To show that being kind to others can increase a person's health and happiness
C To suggest that the world is a better place when people have more energy
D To point out that doing good can get rid of harmful chemicals such as serotonin