Bebop, as a musical style, was developed in the early 1940s. Hence, the correct option is (D).
Bebop is one of the derivative genres that exist in jazz and is often referred to as modern jazz. Bebob music itself developed in the 1940s. At the beginning of its appearance, this bebop was not well-liked by the public and even by musicians around the world. The main characteristic of bebop music is the use of staccato two-tone phrases. In addition, bebop musicians also often use the chromatic scale in their solo playing which makes bebop music tend to prioritize improvisation over other jazz genres.
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