In humanistic theories, what is the name for a final level of psychological development in which individuals strive to realize their uniquely human potential-to achieve anything they are capable of achieving?

The correct answer is self-actualization.

According to the theorist Abraham Maslow, self-actualization refers to process whereby an individual achieves his or her goals by perfecting their skills and abilities. Self-actualization is the full realization and achievement of one's potential, that is deeply rewarding and fulfilling. According to Maslow's theory of the hierarchy of needs, self-actualization is final and highest level of development.