1. PART A: Which of the following identifies the main
claim of the text?
A Genetics do not have any detectable impact on a
person's individual happiness, as scientists
previously believed.
O B By actively attempting to be happier more often,
people can improve their set point of happiness.
OC While genetics may determine a person's range of
happiness, individual choices have a significant
impact on happiness levels.
O D Individual choices can influence a person's
happiness levels, but the effects they have on
overall happiness are insignificant in comparison
to the effects of genetics,

C While genetics may determine a person's range of happiness, individual choices have a significant impact on happiness levels.

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.