If 144/x is an integer and 72/x is an integer, which of the following must be true?
I. 9/x is an integer.
II. 12/x is an integer.
III. 36/x is an integer. Choose the correct option:  A) I, II, and III  B) I and II only  C) III only  D) II and III only  E) I only
The largest possible value of x is 36 (the greatest common factor of 144 and 72), and if x=36 then   III only
<result>C</result>
If 144/x is an integer and 72/x is an integer, which of the following must be true?
I. 9/x is an integer.
II. 12/x is an integer.
III. 36/x is an integer.