Answer:
3. The amount of wallpaper for a wall in a bedroom
Explanation:
1. The number of towels I can fit in a bathroom cabinet
No, sounds more like volume, since a cabinet has space inside.
2. The amount of ribbon used to decorate from one end of a room to the another
No, sounds like perimeter, since a ribbon would need to cover space in one direction.
3. The amount of wallpaper for a wall in a bedroom
Yes, wallpaper is applied in 2 directions and lays flat on a surface to cover a certain area.