Answer:
D. "They were men enough to face the darkness."
Step-by-step explanation:
In this sentence, the author employs a metaphor. A metaphor refers to a comparison between two unlike things with the purpose of clarifying an idea or making it more powerful. In this example, the author wants to make a commentary on the human condition. The way he conveys this is by using the idea of "darkness" as a metaphor for the least desirable parts of humanity.