Volume = 4/3*pi*r^3
As diameter = 6 inches
Radius = Diameter / 2
Radius = 6/ 2
Radius = 3 inches
Putting the value of r in the formula :
=4/3*pi*3^3
=4/3*pi*27
= 36*pi
So according to above explanation,
B) V = 36 π cubic inches , is the correct answer.