Task: Question Answering
Input (English): Question: If the positive integer x is a multiple of 9/15 and the positive integer y is a multiple of 5/3, then xy must be a multiple of which of the following?
I. 5
II. 3
III. 1

 Option A: II only

 Option B: I and II only

 Option C: I only

 Option D: III only

 Option E: I, II, and III
Output (English): Option D