If the sides of a cube are in the ratio 7:3. What is the ratio of their diagonals? Choose one:	A) 9 : 4	B) 8 : 4	C) 7 : 4	D) 7 : 3	E) 6 : 4

Rationale: "explanation : diagonal of a cube = a √ 3 where a is side a 1 : a 2 = 7 : 3 d 1 : d 2 = 7 : 3 where √ 3 cancelled both side answer : d"
Answer: D