Hilt : Sword : : Outwork : ?
Fortress
The first pair, Hilt: Sword, refers to a part of the sword. Outwork, which refers to a section or extension, is logically compared to Fortress. A fortress is a structure or component of defense, similarly to how the hilt is a part of the sword. Hence, the correct answer is a fortress. Thus, the correct answer is (D) Fortress.