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Amplitude modulation (AM) involves varying the amplitude of a carrier signal in proportion to the information or intelligence signal being transmitted. The two fundamental requirements for amplitude modulation are indeed the presence of an RF (radio frequency) carrier wave and the information signal that contains the content to be transmitted, such as voice or data.

The RF carrier serves as a baseline frequency that can be modulated, carrying the information over distances, while the intelligence signal provides the data that needs to be communicated. This relationship allows the receiver to demodulate the signal to extract the original information.

Considering other choices: Two frequencies and a modulation signal may misrepresent the basis of AM since it primarily relies on one carrier wave and its modulating signal. Amplitude and frequency adjustments refer to the modulation process but do not encapsulate the fundamental components needed for AM. Signal and noise levels are essential in communications for assessing the quality of transmission but do not define the basic requirements for amplitude modulation itself.