If x and y are positive integers and 12x=21y what is the least possible value of xy?	Choose one: A) 9 B) 28 C) 63 D) 84 E) 252
12x=21y   =&gt; x/y = 7/4   =&gt; 4x=7y   4(3)=7(3) =&gt; x*y=9   9
<result>A</result>
If x and y are positive integers and 12x=21y what is the least possible value of xy?