Before 1850, French horn and trumpet players would insert crooks into their instruments to change the range of available pitches.
Trumpet is a musical instrument, which is commonly used in classical and jazz genres of music. It is made out of brass, which produces the required form of sound upon blowing air through the hole.
Trumpet and horn players used crooks and inserted them inside the holes of the trumpet in order to achieve different range or levels of pitches that are required to be played out of the trumpet.
Hence, option A holds true regarding a trumpet.
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