Read the sentence.The pirate who sailed his ship in the Atlantic Ocean pilfering from British naval ships and irritating the British navy.

“The pirate” is the complete subject, and “who sailed his ship…” is a clause describing that pirate. But the sentence never states what the pirate did as the main action, so it lacks a complete predicate. For example, adding “was feared by the British navy” would complete it. The correct choice is B, incomplete because it lacks a complete predicate.

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