Concept:Prospero understands that his spell has trapped his enemies, so he chooses to leave them and visit Ferdinand.
Explanation:Prospero confirms that his instructions and charms have worked perfectly on the men who wronged him.
His enemies are now completely "knit up" in confusion, meaning they are fully under his magical control.
He says, “And in these fits I leave them,” which clearly shows his decision to walk away while they remain powerless.
This action is not careless; Prospero intends to go to Ferdinand, who is waiting safely on the island.
He wants to check on the young prince and continue his plan.
Therefore, the reason Prospero leaves his distracted enemies is to meet Ferdinand.
Answer:C. go to Ferdinard