Knee levers are used in playing a pedal steel guitar. Hence, option B is correct.
What is Knee levers?
By pushing their leg and knee left or right against the lever until it stops, a player activates the knee levers. These perform a similar job as the foot pedals, but are controlled by the knees.
The bell crank fingers are attached to the cross rods. The bell crank fingers also regulate how much a string is pulled, just like the pedal stops do. Pull rods are fastened to the bell crank fingers. The changer mechanism is attached to the other end of the pull rods.
Because this enables a guitarist to employ two distinct tuning sons the guitar, pedal steels frequently have two necks. The E9 and C6 tuning are found on the majority of these double neck pedal steel guitars.
Thus, option B is correct.
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