Most Current Motivation Theories Have a Strong Emphasis on Individualism

Most current motivation theories have a strong emphasis on individualism and quality of life. Why is this?

A) They were developed in the United States by Americans.
B) These are the traits needed to successfully motivate people.
C) Researchers tend to concentrate on those traits that are easiest to quantify.
D) Motivation theory relies on the study of personality traits to understand what drives people.
E) These are the two traits that are most distinct in most people worldwide.