Answer:
A) he falls ill and has nightmares.
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.
<u>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.</u>
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.