Which of the following is the likely result of using a Class C amplifier to amplify a single-sideband phone signal?
Why A Class C stage conducts for less than half of each RF cycle, so its output is a series of current pulses shaped by a tuned tank rather than a faithful copy of the input envelope. SSB is an amplitude-varying (non-constant-envelope) mode, so that envelope information is destroyed, producing severe distortion and splatter well outside the intended channel. Only constant-envelope modes such as CW and FM can tolerate Class C; SSB requires a linear amplifier, Class A, AB, or B.
Watch out The choices about reduced intermodulation or better intelligibility describe what a linear amplifier gives you; Class C does the opposite, generating strong intermodulation products and splatter.
Class C = constant-envelope only (CW/FM). Feed it SSB and you get splatter.