The first two sentences of paragraph 6 apply which tool of persuasion?

day and night cannot dwell together. the red man has ever fled the approach of the white
man, as the morning mist flees before the morning sun. however, your proposition seems fair
and i think that my people will accept it and will retire to the reservation you offer them. then
we will dwell apart in peace, for the words of the great white chief seem to be the words of
nature speaking to my people out of dense darkness.

a. evidence
b. assumptions
c. author's use of authority
d. analogy