Discussion
Mass balancing a control surface means
Answer: C
Mass balance is weight forward of the hinge line, so the surface's centre of gravity moves onto or ahead of the hinge and inertia no longer drives it in response to structural bending. That breaks the coupling that produces control surface flutter. Weight behind the hinge would make matters worse. Matching left and right is a rigging and balance check rather than the definition. A bobweight is in the circuit and addresses stick force per g.
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