[单选题]
On a plot of Force versus pe(x-ueu blo41g-daylu 7yr6o il7/ 8q osition (F vs. x), whatqc9ta1nx:,ye represents the work done by the,cet:q y9n ax1 force F?
A. the slope of the curve
B. the length of the curve
C. the area under the curve
D. the product of the maximum force times the maximum x
