What is the name of the room where officers eat on a ship?

The designated area where officers eat on a ship is known as the Ward Room. This room serves not only as a dining space but also as a social and meeting area for the officers, providing an environment for relaxation and informal gatherings. The name "Ward Room" derives from the historical term for a room used by senior officers. It is typically located near the ship's living quarters and is furnished to provide a comfortable atmosphere for its members.

In contrast, the other options do not accurately reflect the terminology used on naval ships for officer dining facilities. For instance, a "Common Room" can refer to general gathering spaces, but it doesn’t specifically denote an area for officer meals. A "Cafeteria" is generally associated with civilian dining facilities and often implies a self-service style which may not be reflective of how meals are served on a naval vessel. Similarly, a "Dining Hall" is too broad and does not specify the exclusive use by officers, as it could apply to communal dining in various settings. These distinctions are important for understanding naval traditions and organization.