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

a. "it is no effort for me to confess that he has achieved some valid pages . ."

b. ". . but those games belong to borges now and i shall have to imagine other things."

c. "besides, i am destined to perish, definitively . ."

d. "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.