The diagonals of two squares are in the ratio of 2:5 then find the ratio of its areas?  Choose the correct choice from the following options: A) 2 : 12 B) 4 : 25 C) 5 : 31 D) 2 : 19 E) 3 : 17

Rationale: "let the diagonals of the squares be 2 x and 5 x ratio of their areas = 1 / 2 ( 2 x ) ^ 2 : 1 / 2 ( 5 x ) ^ 2 = 4 x ^ 2 : 25 x ^ 2 = 4 : 25 answer is b"
Answer: B