Answer:
a. moratorium.
Explanation:
James Marcia who was a famous psychologist has introduced the concept of identity stages or statuses in an effort to explain the existence of an individual. The stages that James Marcia has given are moratorium, diffusion, achievement, and foreclosure.
Moratorium: The term moratorium is defined as a particular period of an individual's identity development that happens after his or her adolescent stage related to identity diffusion and therefore is denoted as the longest stage of development. At this stage, an individual tends to search and explores various alternatives related to a current situation.