If 3<x<6<y<7, then what is the greatest possible positive integer difference of x and y?	Options:  A) 3  B) 4  C) 5  D) 6  E) 7

Rationale: "3 < x < 6 < y < 7 ; 3 < x y < 7 3 + y < x + 7 y - x < 4 . positive integer difference is 3 ( for example y = 6.5 and x = 3.5 ) answer : a ."
Answer: A