Read these lines from the poem.

Where the clear stream of reason has not lost its way
Into the dreary desert sand of dead habit

Why did the speaker choose to include these lines in the poem?

a. to serve as a warning of what may happen should people choose to resist authority and think for themselves
b. to convey contempt for people who have chosen to become lazy in their thoughts and actions
c. to create a clear contrast between free thinking as positive and the lack of independent thought as negative
d. to compare the absence of knowledge to a body of water that has no direction