Four sports objects are listed below:
P. Table-tennis ball (0.0027kg)
Q. Cricket ball (0.16kg)
R. Bowling ball (6kg)
S. Shot-put sphere (7.26kg)
Which of the following shows the correct ascending order of their inertia?
a) P<Q<S<R
b) Q<P<R<S
c) P<Q<R<S
d) S<R<Q<P