The perimeter of the floor of a room is 18 m and its height is 3 in. What is the area of 4 walls of the room?

• A.  \[21\,\,{{m}^{2}}\]                            
• B.  \[42\,\,{{m}^{2}}\]
• C.  \[54\,\,{{m}^{2}}\]                
• D.  \[108\,\,{{m}^{2}}\]