Which modulation technique is used to encode information in the amplitude of a carrier wave?

A) Frequency Modulation (FM)

B) Phase Modulation (PM)

C) Amplitude Modulation (AM)

D) Pulse Width Modulation (PWM)

Answer: C) Amplitude Modulation (AM)

Explanation: Amplitude Modulation (AM) involves varying the amplitude of the carrier wave in accordance with the message signal. This technique is commonly used in radio broadcasting.