In a circus, an acrobat stands at the centre of the rotating table rotating with 60 rpm with his hands outstretched. When the acrobat folds his hands back, his moment of inertia becomes (3/4)th of the initial value. Which of the following statements is correct?
(A) The angular speed of the acrobat increases by 10 rpm.?
(B) The angular speed of the acrobat increases by 20 rpm.
(C) The increase in the acrobat?s rotational kinetic energy is less than 30%.
(D) The increase in the rotational kinetic energy of the acrobat is greater than 30%.