An external interaction exerts a force 
on a certain system as the place where the force is applied moves a displacement 
. Which of the following is the correct component expression for the work done by the interaction on the system?
A. W = [Fx dx, Fy dy, Fz dz]
B. W = ?[Fx dx, Fy dy, Fz dz]?
C. W = Fx dx + Fy dy + Fz dz
D. Some other expression (specify)
C. W = Fx dx + Fy dy + Fz dz
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