Jonathan Swift to improve the narrator's reliability in the above passage is to Provide more description of Mr James Bates, both his appearance and personality. Thus, option "D" is correct.
The first place that Gulliver visits in his journey is Lilliput. After a shipwreck, he has washed ashore, and left unconscious. When he wakes up, Gulliver sees that the Lilliputians have tied him to a frame of wood and are pulling him by fifteen hundred horses. They have to do this in order to move him, as they are only 15cm tall.
Thus, option "D" is correct.
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