Step 1: Understanding the Concept:
Self-actualization is the highest level of Maslow's hierarchy of needs.
Step 2: Detailed Explanation:
It represents the growth of an individual toward the fulfillment of the highest needs—those for meaning in life, in particular.
It refers to the desire for self-fulfillment, namely, to the tendency for him [the individual] to become actualized in what he is potentially.
Options (a), (b), and (c) are deficiency needs (D-needs), whereas self-actualization is a being need (B-need).
Step 3: Final Answer:
Self-actualization is the process of becoming everything one is capable of becoming.