A method for representing digital data analog signals by changing the phase of the analog carrier to represent the digital information is known as

Answer: Option B

Phase-shift keying (PSK) is a method of digital communication in which the phase of a transmitted signal is varied to convey information. There are several methods that can be used to accomplish PSK. The simplest PSK technique is called binary phase-shift keying (BPSK). It uses two opposite signal phases (0 and 180 degrees).

Source : techtarget.com