The outside dimensions of a living room are 13' 0" x 22' 0". If the wall thickness is 5 1/8" , what are the inside dimensions of the living room?
A. 12' 71/8" x 21' 71/8"
B. 12' 67/8" x 21' 67/8"
C. 12' 13/4" x 21' 13/4"
D. 7' 101/2" x 16' 101/2"