Consider the numbers 1 through 6 numbered on the coins below. Ella takes a coin from each of the three columns. Bella takes a coin from each of the remaining two columns. Cassandra takes the remaining coin. In how many ways could they have taken out the six coins? [asy]
size(100);
draw(Circle((0,0),0.45));
label("1",(0,0));
draw(Circle((0,1),0.45));
label("2",(0,1));
draw(Circle((0,2),0.45));
label("3",(0,2));
draw(Circle((1,0),0.45));
label("5",(1,0));
draw(Circle((1,1),0.45));
label("4",(1,1));
draw(Circle((2,0),0.45));
label("6",(2,0));
[/asy]
<spanclass=′latex−bold′>(A)</span>9<spanclass=′latex−bold′>(B)</span>12<spanclass=′latex−bold′>(C)</span>15<spanclass=′latex−bold′>(D)</span>18<spanclass=′latex−bold′>(E)</span>20