Answer:
A) he falls ill and has nightmares.
Step-by-step explanation:
'The Seventh Man' is a short story written by Haruki Murakami. The story revolves around the three characters-- the Seventh Man, the childhood of the Seventh Man, and the Seventh Man's childhood best friend.
The narrator recounts the reason for his present condition of trauma. In the story, the narrator watches his best friend K die in tsunami that hits his town. The narrator, though surviving the storm, begins to struggle with nightmares of seeing his best friend die in front of his eyes.
Thus the correct option that summarizes the happenings after K's death is that the narrator falls ill and suffers nightmares.
Therefore, option A is correct.