What type of plate can be used as an under liner for soup?

The correct answer is based on the specific purposes and dimensions of various types of plates used in food service. The breakfast plate is typically larger and designed to accommodate both a bowl of soup and the accompanying utensils, making it suitable for serving soup as part of a meal setting.

Using a breakfast plate as an under liner for soup allows for a practical configuration—where the soup bowl fits comfortably while still providing space for garnishes or side dishes that might accompany a soup service. The wider rim of the breakfast plate provides stability and reduces the risk of spills, which is particularly important in a dining context, especially in the Navy's structured service environments.

In contrast, other plate types like the salad plate, entrée plate, or appetizer plate may not provide the same level of utility or space. They are generally designed for specific uses and might be smaller or less suitable for holding both a bowl of soup and any additional items, which can be a consideration in food service settings. Therefore, the breakfast plate is the most appropriate choice for this function.