According to research,what is one of the well-known reasons that increases in income don't necessarily bring increases in happiness

A)  genetics 
B)  grit 
C)  subjective-well being 
D)  hedonic adaptation

Hedonic Adaptation

The observed tendency of individuals to return to a relative level of happiness despite major positive or negative events or life changes.

Income

The financial earnings received by an individual or group, typically calculated on a weekly, monthly, or yearly basis, from work, investments, or other sources.

Happiness

A state of well-being that encompasses living a good life, with a sense of meaning and deep satisfaction.