Answer:
a. The manager.
Step-by-step explanation:
Joseph Conrad's "Heart of Darkness" is a critical take on the horrors of Western civilization along the Congo. Centered around the character of Marlow, a sailor who had gone to assist in the trade, the story touches on themes of civilization, imperialism, truth, absurdity, etc.
Marlow's direct supervisor is the manager of the Central Station. He is a greedy, cold-hearted man who wants nothing to do with others and works only for his personal gain. He also held a secret wish to get rid of Kurtz so that he can take his place and be successful.
Thus, the correct answer is option a.