Discussion
An internal sealed balance works by
Answer: B
The surface's nose extends into a chamber sealed by a flexible diaphragm, and the pressure difference across that chamber acts ahead of the hinge to oppose the hinge moment. It gives effective balance with no external area and little drag penalty, which is why it is common on transports. No engine air is involved. A spring in the actuator would change the feel rather than the aerodynamic moment. Reducing the aft chord would reduce effectiveness as well as hinge moment.
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