Mary is on a business trip and meets an old friend she dated in college. She finds that she is still attracted to him, and something inside her tells her, "Go ahead. Invite him to your room and kiss him." However, Mary is happily married with two young and adorable children. Mary and her old friend end up chatting for a while and then go their separate ways. According to the Freudian framework, which of the following parts of Mary's personality is most likely to have prevailed in this situation?

A. id

B. thanatos

C. superego

D. libido