Explanation: A balanced modulator is a circuit designed to combine a radio frequency (RF) carrier with an audio modulating signal in a specific way. Its primary function is to suppress the carrier wave itself while allowing the modulating signal to produce its upper and lower sidebands. This is achieved by feeding the carrier to two non-linear devices (like diodes or transistors) in phase opposition, while feeding the modulating signal in phase. The carrier components effectively cancel each other out at the output, leaving only the sum and difference frequencies, which are the sidebands. The result is a double sideband, suppressed carrier (DSB-SC) signal, making B correct. Option A is incorrect because balanced modulators are used for amplitude modulation (AM), not frequency modulation (FM). Option C is incorrect because a balanced modulator creates *both* sidebands; an additional filter is required to remove one for single sideband (SSB). Option D is incorrect because its main purpose is carrier *suppression*, not full carrier production.