Question

canteen means :
a room with food and personal items sold to personnel at an institution
a piece of furniture that stands at the side of a dining room
a knife fixed to the end of a rifle and used as a weapon
a platform raised to give prominence to the person on it

Explanation:

The word "canteen" commonly refers to a place where food and personal - items are sold to people in an institution like a school, military base, etc. The other options describe different objects (furniture, weapon, platform) which are not the meaning of "canteen".

Answer:

a room with food and personal items sold to personnel at an institution