If x and y are prime numbers such that x > y > 2, then x^2 − y^2 must be divisible by which one of the following numbers?  Choose one:	A) 3	B) 4	C) 5	D) 9	E) 12
If x=5 and y=3, then x^2-y^2=16 and 16 is divisible only by 4 from the options, thus it must be correct.   Answer: 4.
<result>B</result>
If x and y are prime numbers such that x > y > 2, then x^2 − y^2 must be divisible by which one of the following numbers?