Answer:
a. Bebop
Explanation:
Thelonious Monk, Charlie Parker, and Dizzy Gillespie were the three key figures in the development of bebop.
Bebop is a form of early mordern jazz music which developed during the 1940s - 1950s. While this style of music was controversial at first as it stirred from the traditional jazz style, it became more and more popular especially among the teens.
The difference between jazz and bebop is that jazz is a more traditional style of music with light and soft tunes while bebops are mostly upbeat and fast.
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