If y is the smallest positive integer such that 31,360 multiplied by y is the square of an integer, then y must be	Choose the correct choice from the following options.
A) 21	B) 10	C) 61	D) 72	E) 14

Rationale: "31360 = 8 * 8 * 7 * 7 * 5 * 2 , so we need one 5 and one 2 to make it a square of a number . so 5 * 2 = 10 ans : b"
Answer: B