Hey
savvysearch, it;s the stranger again.
this one is not that hard. Looking at the reactancts do you see that both of them must be equvalent in number of moles?
#moles=V*Molarity. So that means the reactants are one to one. The only answer that is one to one ration (coeficients are equal) is the answer you provided.
Good luck.
-Balki-