Which of the following does conrad use as a metaphor for imperialism? a. it is a "black shadow of disease and starvation, lying confusedly in the greenish gloom." b. it is "a flabby, pretending, weak-eyed devil of a rapacious and pitiless folly." c. it is a "miracle" because it looks good in the midst of the hot, sticky, sweaty jungle. d. it is a man-of-war inexplicably "firing into a continent."