Final answer:
James Marcia was influenced by Erikson but thought his ideas were oversimplified. He developed the concept of identity status, which expanded upon Erikson's stages of psychosocial development.
Step-by-step explanation:
The correct answer is c) James Marcia. James Marcia was a psychologist who built upon the work of Erik Erikson but believed that Erikson's ideas were oversimplified. Marcia developed the concept of identity status, which categorized individuals into four different identity statuses: identity diffusion, identity foreclosure, identity moratorium, and identity achievement. Marcia's theory expanded upon Erikson's stages of psychosocial development by providing a more nuanced understanding of the process of identity formation.