Two Particles, a and B, Are in Uniform Circular Motion

Multiple Choice

Two particles, A and B, are in uniform circular motion about a common center. The acceleration of particle A is 8.5 times that of particle B. The period of particle B is 2.0 times the period of particle A. The ratio of the radius of the motion of particle A to that of particle B is closest to

A) rA/rB = 2.1.
B) rA/rB = 4.3.
C) rA/rB = 18.
D) rA/rB = 0.24.
E) rA/rB = 17.