One end of a light string 4 m in length is fixed to a point on a smooth wall and the other end fastened to a point on the surface of a smooth sphere of diameter 2.25 m and of weight 100 kg. The tension in the string is_______.

A)
17.5 kg
B)
19.5 kg
C)
22.5 kg
D)
25 kg

Correct Answer :   22.5 kg