The Metaphor that Conrad used as a metaphor for imperialism is:
A. It is a "black shadow of disease and starvation, lying confusedly in the greenish gloom."
In the Novel Heart of Darkness, Józef Teodor Konrad Korzeniowski, better known as Joseph Conrad ( was born in Berdyczów, then Polony, now Ucrania, in Dcember the Third 1857 – was a Polish novelist who addopted English as his Literary language . Conrad writes about Human's vulnerability.
Conrad used for his metaphors elements like the Jungle and the Congo, the Dark and and Light to show contrast and inequality.
So the correct quotation is:
A. It is a "black shadow of disease and starvation, lying confusedly in the greenish gloom."