The respective ratio of radii of two right circular cylinders (A & B) is 4 : 7. The respective ratio of the heights of cylinders A and B is 2 : 1. What is the respective ratio of volumes of cylinders A and B?

• A. 25 :42
• B. 23 : 42
• C. 32 : 49
• D. 30 : 49
• E. 36 : 49