Discussion
Why is a balanced modulator so called?
Answer: B
The name refers to the symmetry that makes the carrier components cancel while the sidebands add, which is what suppresses the carrier without any filtering. In practice the balance is trimmed with a potentiometer and its accuracy sets the carrier suppression figure. Impedance matching is a separate design matter. Sideband amplitude balance follows automatically from a real message rather than from the circuit's name. And supply current symmetry is incidental.
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