The foot of a person riding a stationary bicycle moves in a circle with a radius of 23cm, centered 33cm above the ground, making 2 revolutions per second. At x=0, the pedal is 10cm above the ground.

What is the radius of the circle in which the foot moves?
A) 23cm
B) 33cm
C) 10cm
D) 2 revolutions per second

(Note: unnecessary space and unnecessary words have been removed)