Function w is the difference when function n is subtracted from function m.

m(x) = 5x - 1
n(x) = 7x + 13

Which equation defines function w?

A. w(x) = -2x + 12

B. w(x) = 2x - 14

C. w(x) = -2x - 14

D. w(x) = 2x + 12​