Explanation: When the first speech-amplifier of a transmitter is overexcited, it means the input signal level is too high for the amplifier to process linearly. This causes the amplifier to clip the peaks of the waveform. This non-linear operation changes the fundamental shape of the original audio signal. The introduction of unwanted harmonics and intermodulation products due to clipping means the output signal is no longer a faithful reproduction of the input. This alteration of the waveform is precisely what is defined as **distortion**. Even if the final modulation percentage isn't exceeded, the quality of the signal being modulated has been degraded. Therefore, the output would be distorted (C). Options A and B describe specific waveforms or phenomena that are not the primary or direct result of general overexcitation in this context. Overexcitation leads directly to non-linear amplification and waveform deformation, which is distortion.