A man stands on a rotating platform with his arms stretched holding a 5 kg weight in each hand. The angular speed of the platform is `1.2 rev s^(-1)`. The moment of inertia of the man together with the platform may be taken to be constant and equal to `6 kg m^(2)`. If the man brings his arms close to his chest with the distance of each weight from the axis changing from 100 cm to 20 cm . The new angular speed of the platform is

Options

A. 7
B. 5
C. 4
D. 6