If x and y are prime numbers such that x > y > 1, then x^2 − y^2 must be divisible by which one of the following numbers?
Choose the correct answer.
A) 3	B) 4	C) 5	D) 9	E) 12
If x=3 and y=2, then x^2-y^2=5 and 5 is divisible only by 5 from the options, thus it must be correct.   Answer: 5.
<result>C</result>
If x and y are prime numbers such that x > y > 1, then x^2 − y^2 must be divisible by which one of the following numbers?