If a solid piece of iron in the form of a cuboid, of dimensions 49 cm $$\times$$ 33 cm $$\times$$ 24 cm, is
moulded to form a solid sphere, then the radius of the sphere is ______. [Use $$\pi = \frac{22}{7}$$]

A

16 cm

B

10 cm

C

18 cm

D

21 cm