A Force Acts on an Object, Causing It to Move

Multiple Choice

A force acts on an object, causing it to move parallel to the force. The graph in the figure shows this force as a function of the position of the object. How much work does the force do as the object moves from 4 m to 6 m?

A) 30 J
B) 0 J
C) 20 J
D) 70 J
E) 40 J