14. A rectangular floor is covered by a rug
except for a strip p meters wide along
each of the four edges. If the floor is m
meters by n meters, what is the area of
the rug, in square meters?
(A) mn - p (m + n)
(B) mn - 2p(m +n)
(C) mn - p2
(D) (m - p)(n - p)
(E) (m -2p)(n - 2p)