question_answer

The curved surface area of a cylinder with its height equal to the radius, is equal to the curved surface area of a sphere. The ratio of volume of the cylinder to that of the sphere is

A)  \[\sqrt{2}:\,3\]  

B)  \[2\sqrt{2:\,3}\]

C)  \[3:\,2\sqrt{2}\]

D)  \[3:\,\sqrt{2}\]