Making changes to improve the quality of life for people.
D
I answered C and it was marked wrong
Explanation: Chemicals
There are four primary chemicals in the brain that effect happiness: dopamine, oxytocin, serotonin, and endorphins. By designing gamified experiences that activate these chemicals, you can increase your users' happiness and loyalty.
The term “designer drugs” refers to drugs that are created in a laboratory (typically, an “underground,” or secret, illegal lab). A designer drug is created by changing the properties of a drug that comes from a plant—such as cocaine, morphine, or marijuana—using the tools of chemistry.
Health food . sports sprit encouraged