The correct option is A 3 cm
Let, the radius of the smaller sphere be r.
Given: Radius of initail sphere is 9 cm.
We know that, in the given situation, volume remains constant.
Volume of sphere is 43πr3.
Initial volume = Final volume
⇒43π(93)=27×43πr3
⇒93=27×r3
⇒3 cm=r
Thus, radius of each smaller sphere is 3 cm.