What happens to the production of fat cells when you become an adult?

In adulthood, approximately 8% of the fat cells die yearly, they are then replace by new ones. The result of this is that adults develop a constant number of fat cells, this applies to those who gain more weight and those who lose masses of weight. What causes the body weight to rise and fall is the volume of fat cells. 

The answer would be c (set)hope this ! (:

The answer would be d. most contraceptives are effective when used properly