Answer:
D. suggest that his fantastic story can be verified.
Step-by-step explanation:
The narrator is saying that the reader can go and see the machine for themselves to verify the truth of his story. This suggests that he wants the reader to believe his story and is providing them with an opportunity to confirm it for themselves. It is not likely that the narrator is trying to exaggerate his contribution to Perry's work or compare his scientific ability to Perry's skill, as these topics are not mentioned in the sentence. It is also unlikely that the narrator is describing the desert, as this is not relevant to the story or the suggestion that the reader can verify the truth of the story.