The correct option is A 244π3
Given, internal diameter =8cm and external diameter =10cm
Volume of a hollow sphere of outer Radius R and inner radius r =43π(R2−r3)
Inner radius of the spherical shell =82=4cm
Outer radius of the spherical shell =102=5cm
Hence, volume of spherical shell =43×π×(53−43)=43×π×61=244π3cm3