Masses M1 and M2 are initially separated by a distance Ra. Mass M2 is now moved further away from mass M1 such that their final separation is Rb. Which of the following statements best describes the work Wab done by the force of gravity on M2 as it moves from Ra to Rb?
A. Wab > 0.
B. Wab = 0.
C. Wab < 0.
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