If the volume of two cubes are in the ratio 64:1, the ratio of their edges is:	Choose the correct choice from the following:
A) 3 : 1  B) 3 : 2  C) 3 : 5  D) 4 : 1  E) none of these

Rationale: "explanation : let the edges be a and b of two cubes , then a 3 / b 3 = 64 / 1 = > ( a / b ) 3 = ( 4 / 1 ) 3 a / b = 4 / 1 = > a : b = 4 : 1 option d"
Answer: D