If 3<x<6<y<8, then what is the greatest possible positive integer difference of x and y?  Choose the most appropriate option:
A) 3
B) 4
C) 5
D) 6
E) 7

Rationale: 3 < x < 6 < y < 8 ; 3 < x y < 8 3 + y < x + 8 y - x < 5 . positive integer difference is 4 ( for example y = 7.5 and x = 3.5 ) answer : b .
Answer: B