Integers x and y are consecutive multiples of 8. Integers a and b are consecutive multiples of 6. In terms of x, y, a and b, what is the ratio of the average of x & y and the average of a & b ? (A) (x+y)/(a+b) (B) (a+b)/(x+y) (C) a+b/4/y-x/4 (D) (4/3)(a+b)/(x+y)