One Implication of the Phenomenon Described by Economist Richard Easterlin

One implication of the phenomenon described by economist Richard Easterlin as the "hedonic treadmill" is that

A) people who consume more goods and services are happier than those who consume less.
B) people can only become happier if their consumption continues rising indefinitely.
C) there is a threshold of consumption that one must cross before one can be happy.
D) we can combine the happiness of different individuals to get "total happiness."