Gertrude is close to finishing her degree in biology and has been offered several good jobs in her field. however, gertrude decides that she really wants to become a carpenter. she quits school and becomes a very happy and successful carpenter. according to maslow, gertrude

is self-actualized      

Explanation:

Self-actualization: The term has been introduced by the famous psychologist Abraham Maslow in his theory of hierarchy of needs. He has given five stages in his theory and self-actualization is the last i.e the fifth stage. According to Maslow, a person needs to fulfill all the previous needs to reach the self-actualized need.

According to Maslow, the stage of self-actualization is defined as the need of an individual for personal development and growth throughout the different stages of an individual's life. He believes that if an individual reaches the stage of self-actualization, he or she is considered to reach full potential as an individual.

i would say b. research typically uses a variety of sources