What ultimately leads to Gulliver's return to England?

The correct answer highlights that Gulliver's return to England is facilitated by being rescued and taken in by a ship's crew. Throughout "Gulliver's Travels," Gulliver finds himself in various extraordinary situations, each leading to different experiences and interactions with the cultures he encounters. His eventual return to England depends on the kindness and assistance of those who find him.

In this case, after facing many trials, including being stranded and experiencing life among the Houyhnhnms, Gulliver is fortunate enough to be discovered by a ship's crew that offers him passage home. This moment underscores the themes of connection and reliance on others for aid, which are woven throughout the narrative.

The other choices do not accurately reflect the circumstances leading to Gulliver's return. He does not independently find a ship after extensive searching; nor does he opt to use small boats to return, which would suggest a more solitary and adventurous journey. Additionally, he does not receive a formal invitation from the King to return, as that scenario would imply a premeditated or bureaucratic arrangement rather than the serendipitous encounter with the ship's crew that ultimately brings him home. This makes the correct answer the most aligned with Gulliver's experiences as described in the story.