Correct Answer: sheath

Solution : The second option is the correct answer.

"Sheath" is the most appropriate term that specifically refers to a case or covering designed for holding and protecting a sword when it is not in use.

The meanings of other options are as follows:

• A sleeve is a part of a garment that covers the arm.
• A quiver is a container for holding arrows.
• A wrapper is a covering or packaging material, typically used for enclosing objects or goods.

Therefore, the correct answer is sheath.