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What is the main problem in using quadrature amplitude modulation?

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What is the main problem in using quadrature amplitude modulation?

(a) high bandwidth is required

(b) high power is required

(c) incompability with ordinary AM radio waves

(d) bandwidth required is less

I had been asked this question in class test.

My enquiry is from Spectrum of AM SC Waves in section Side Band Techniques of Analog Communications

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The correct answer is (c) incompability with ordinary AM radio waves

Explanation: Quadrature Amplitude Modulation (QAM) is widely used for combining two amplitude modulated waves into a single channel. It is both an analog and digital modulation technique. It has many advantages over other modulations such as PSK but its disadvantage is its incompability with ordinary radio waves.

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