Answer:
D. it includes a question that the reader will want to know the answer to.
Step-by-step explanation:
Suspense in the written fiction or narrative means there is a rising sense of uncertainty or anticipation that is the part of the story. It creates tension and serves as the tool to build up the atmosphere of the piece. Suspense is often the part of the plot adding up to some mystery or puzzle that the narrative is trying to solve.
In the passage, the questions posed (where is the third person that made the graves and who is the third person) is the element of the suspense. Readers want to know this information as much as Manjiro. It is part of the narrative. By writing these questions, especially by building them up from first to the third, the author builds up the suspense and anticipation of the answers, making sure the readers will be waiting for an answer with careful awareness. They are getting more and more invested in the story in the process.