Answer:
C While genetics may determine a person's range of happiness, individual choices have a significant impact on happiness levels.
Step-by-step explanation:
Human genes according to the passage determines significantly a person's level of happiness. Proving that there is a good link between genes and feelings.
The text describes how moods are coordinated mainly by genes, though coupled with some environmental factors. These factors are some choices that an individual can make to increase the level of his/ her happiness. Most people feel happy when success is achieved or profit made, but otherwise when in loss or bad state.
This shows that though genes determine majorly a person's happiness, but individual choices has a significant impact.