JEE Main Physics question

A ball of mass 0.1 kg is whirled in a horizontal circle of radius 1 m by means of a string at an initial speed of 10 r.p.m. Keeping the radius constant, the tension in the string is reduced to one-quarter of its initial value. The new speed is

• (A)20 r.p.m.
• (B)5 r.p.m.Correct
• (C)10 r.p.m.
• (D)14 r.p.m.