To provide the best-supported inference, we would need to analyze the details of the passage related to Harborough and the ship's Captain. Without the passage text, I can only suggest which inference might be more likely based on typical narrative details.
If the passage describes Harborough in a way that shows confidence, arrogance, or condescension toward others, then the inference "Harborough feels he is superior to others" would be best supported.
If there are descriptions of Harborough's experiences, knowledge, or storytelling related to his journeys, then "The ship’s Captain has traveled widely" would be more fitting.
If there are indications that Harborough had an urban upbringing, then "Harborough grew up in a city" would apply.
Finally, unless the passage specifically discusses the swimming abilities of people who travel by sea, "Most people who travel by sea cannot swim" is likely the least supported inference.
Without the content of the passage, please choose the inference that best aligns with what you know from it.