The volume of a sphere of radius 10.5 cm is

(b)  4851 cm3

Volume of the sphere $=\frac{4}{3} \pi r^{3}$

$=\frac{4}{3} \times \frac{22}{7} \times 10.5 \times 10.5 \times 10.5$

$=88 \times 0.5 \times 10.5 \times 10.5=4851 \mathrm{~cm}^{3}$