What kind of metaphor does Frederick Douglass use to describe a nation?

Douglass finishes the extended metaphor of nations as rivers by employing auditory, visual, and tactile imagery with the words “howl,” “abyss,” and “wind.” Such language helped the audience hear, see, and feel this metaphor and sense his pessimism as he likens the decline of nations to the drying up of rivers.

Explanation:

special interest groups must step back and let the process work itself out a representative can amend it at several points in the congressional staffers must do homework and report to the floor on what they 've learned

i also think it is c