Which piece of textual evidence best supports the main character's dual existence?

A. ". . . but those games belong to Borges now and I shall have to imagine other things."
B. "It is no effort for me to confess that he has achieved some valid pages . . ."
C. "I shall remain in Borges, not in myself (if it is true that I am someone), but I recognize myself less in his books than in many others or in the laborious strumming of a guitar."
D. "Besides, I am destined to perish, definitively . . ."