The vital effect that the writer achieved through the use of first-person narration is A. The suspense increases because the reader does not know what the seventh man knows.
The first person narration refers to the point of view where the study is narrated by a character. In this case, the story may be about the character or sharing want he saw.
In this case, since the writer was telling the story of someone else, there was an increase in the suspense because the reader does not know what the seventh man knows.
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