If m and n are positive integers, and m=2n and k=9m, then -  Select
A) k is a factor of m.  B) 2m is a factor of k.  C) 3m is a factor of k/2.  D) m/2 is a factor of k.  E) k is a factor of m/2.
m=2n --&gt; m is even.   k=9m --&gt; m is factor of k, thus m/2 = integer must also be a factor of k.   Answer: m/2 is a factor of k..
<result>D</result>
If m and n are positive integers, and m=2n and k=9m, then -