JEE Main Physics question

Let be the acceleration due to gravity at earth's surface and be the rotational kinetic energy of the earth. Suppose the earth's radius decreases by 2% keeping all other quantities same, then [BHU 1994, JIPMER 2000]

• (A) decreases by 2% and decreases by 4%
• (B) decreases by 4% and increases by 2%
• (C) increases by 4% and increases by 4%Correct
• (D) decreases by 4% and increases by 4%