Rockabilly is music element developed in the 1950s as a response to the socially abrasive lyrics of some African American rock-and-roll artists.
In the 1950s, rock and roll was only getting started. Rock and roll was a revolutionary new genre of music that fused elements of R&B, pop, blues, and hillbilly music to produce a sound that shook the nation.
"When they bring a couple of guitars together with a backbeat, that's rock and roll," musician Ray Charles said of the music.
Thus, option B is correct.
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