Person X Pushes Twice as Hard Against a Stationary Brick

Person X pushes twice as hard against a stationary brick wall as person Y. Which one of the following statements is correct?

A) Both do the same amount of positive work.
B) Both do positive work, but person X does one-half the work of person Y.
C) Both do positive work, but person X does four times the work of person Y.
D) Both do positive work, but person X does twice the work of person Y.
E) Both do zero work.