Which of the following excerpts is an analogy?
A. First is the danger of futility, the belief there is nothing one man or one woman can do against the enormous array of the world's ills. . . . (paragraph 2)
B. [A]nd crossing each other from a million different centers of energy and daring, those ripples build a current which can sweep down the mightiest walls of oppression and resistance. . . . (paragraph 4)
C. Few men are willing to brave the disapproval of their fellows, the censure of their colleagues, the wrath of their society. (paragraph 5)
D. [T]hose with the courage to enter the conflict, will find themselves with companions in every corner of the world. (paragraph 6)