Two objects, P and Q, each undergo uniform circular motion in separate horizontal circles. Object P moves in a circle of radius 0.40m with a period of 1.2s. Object Q moves in a circle of radius 0.60m and completes each revolution in 0.80s. What is the ratio of the centripetal acceleration of object Q to that of object P?
a) 2.3
b) 0.67
c) 3.4
d) 1.5