The word "unsurpassed" in the third paragraph is closest in meaning to ______.

A．his belief in his students
B．his contempt for conservatives
C．his recognition of the legal system
D．that he was not afraid of death

A．it was surprising that Socrates was so famous
B．Socrates was not so learned as he is reputed to have been
C．Socrates used the work of his students in teaching
D．the authorities refused to publish Socrates' works