Which description best fits the speaker based on his language use?

I can remember how when I was young, I believed death to be a phenomenon of the body. Now I know it to be merely a function of the mind—and that of the minds that suffer the bereavement.

(from As I Lay Dying by William Faulkner)

a young farmworker

an uneducated trader

an old, philosophical doctor

a vagrant outcast from society