Which style of music imitates speech using pitch fluctuations, rhythms, and so on?
a)aria
b)recitative
c)oratorio
d)arioso

The best answer is "B"

recitative

Explanation:

Aria: an aria is a self-contained piece for one voice, with or without instrumental or orchestral accompaniment, normally part of a larger work.

recitative: imitates speech using pitch fluctuations, rhythms.

Oratorio: An oratorio is a musical piece that is usually lengthy and based on some Biblical or religious event.

Arioso: arioso is a category of solo vocal piece, usually occurring in an opera or oratorio, falling somewhere between recitative and aria in style.

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