Question

select the best evidence to support the statement that to some observers, the ship is moving in an unusual way.
the ship drew on and had safely passed the strait, which some volcanic shock has made between the calasareigne and jaros islands; had doubled pomègue, and approached the harbor under topsails, jib, and spanker, but so slowly that the onlookers asked one another what misfortune could have happened on board. however, those experienced in navigation saw plainly that if any accident had occurred, it was not to the vessel herself, for she approached with all the evidence of being skillfully handled. the pilot, who was steering the ship towards the narrow entrance of the inner port, was a young man, who, with vigor and a watchful eye, observed every motion of the ship.
adapted from alexandre dumas, the count of monte cristo

Explanation:

The text states that the ship approached the harbor "so slowly that the onlookers asked one another what misfortune could have happened on board." This shows that the ship's slow movement made observers think it was moving unusually.

Answer:

The ship drew on and had safely passed the strait...approached the harbor under topsails, jib, and spanker, but so slowly that the onlookers asked one another what misfortune could have happened on board.