Answer: D. Marlow calls an African soldier who works for the colonialists "one of the reclaimed".
Explanation:
Sarcasm is when the author is using irony to express lack of consideration for a certain matter. In this phrase, Marlow is talking about the African soldier as if he were an object that was "reclaimed". As an African soldier working for the colonialists, things must have been very hard for that person. Unfortunately, the author chooses to show his contempt for the African soldier describing him as "reclaimed".
All the other sentences are descriptive explanations of the author's impressions.
