Final answer:
Louis Armstrong did not introduce the bebop style to jazz; this was developed by other musicians in the 1940s. Armstrong was known for scat singing, swing rhythm, and improvisation.
Step-by-step explanation:
The innovation that was NOT introduced to jazz by Louis Armstrong is d) Bebop style.
Louis Armstrong was a central figure in the Harlem Renaissance and contributed significantly to the development of jazz. Some of the features Armstrong popularized include scat singing, where the vocalist uses nonsensical syllables to improvise melodies, and swing rhythm, which provides a compelling groove that makes jazz so distinctive.
Although Armstrong was indeed an adept improviser and played a pivotal role in establishing jazz as an art form, the bebop style emerged later and was developed by musicians such as Charlie "Bird" Parker and Dizzy Gillespie in the 1940s, well after Armstrong's initial innovations had taken root.
Armstrong's influence spanned beyond his collaborations with artists like Bessie Smith and his own performances, but he did not contribute to creating the bebop style. Bebop is characterized by its fast tempo, complex chord progressions, and intricate improvisations, which differentiated it from the swing style that was prevalent during Armstrong's prime in the jazz scene.