Task: Question Answering
Input (English): Question: The function f is defined for each positive three-digit integer n by f(n)=2x3y5zf(n)=2x3y5z , where x, y and z are the hundreds, tens, and units digits of n, respectively. If m and v are three-digit positive integers such that f(m)=9f(v), them m-v=?

 Option A: 8

 Option B: 9

 Option C: 18

 Option D: 20

 Option E: 80
Output (English): Option D