If 3<x<6<y<7, then what is the greatest possible positive integer difference of x and y?	Choose the correct choice:
A) 3 B) 4 C) 5 D) 6 E) 7
3 &lt; x &lt; 6 &lt; y &lt; 7;   3 &lt; x   y &lt; 7   3 + y &lt; x + 7   y - x &lt; 4.   Positive integer difference is 3(for example y = 6.5 and x = 3.5)   3nswer:3.
<result>A</result>
If 3<x<6<y<7, then what is the greatest possible positive integer difference of x and y?