A ‘scabbard’ is a leather or metal sheath, used for covering the blade of a sword or dagger. Thus option D is correct. On the other hand, a ‘cask’ is a large barrel-like container that is used to store liquids such as wine and other alcoholic beverages. ‘A sword’ cannot be stored in here, hence option A is incorrect. Similarly, a ‘tub’ cannot be used to store a sword because a ‘tub’ a small plastic or cardboard container used to store food, for example, “a tub of yogurt” or “a tub of ice cream”. Thus option B is incorrect. Whereas a ‘coffer’ is a small chest that is used to store jewels, coins, gold or other valuable possessions. Hence option C is incorrect.