If 3<x<6<y<10, 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 < 10 ; 3 < x y < 10 3 + y < x + 10 y - x < 7 . positive integer difference is 6 ( for example y = 9.5 and x = 3.5 ) answer : d ."
Answer: D