Luisa earns money mowing her neighbors' lawns.

The revenue for mowing x lawns is r(x) = 20x.
Luisa's cost for gas and the mower rental is c(x) = 4x + 25.

Her profit from mowing x lawns is p(x) = (r – c)(x). What is p(x)?

A. p(x) = 24x – 25

B. p(x) = 16x + 25

C. p(x) = 16x – 25

D. p(x) = 24x + 25