Final answer:
The correct answer is option c) pennant.
Step-by-step explanation:
The correct answer is option c) pennant. A pennant is a long, tapering flag, usually triangular in shape, that is flown from the mast of a ship. In the given context, the pennant flying from the mast of the approaching ship indicated that it was a pirate ship. This historical reference shows how different types of flags were used to convey messages and meanings during naval warfare.