Of What Use Is It to Find a Rate Law

Of what use is it to find a rate law for a reaction?

A) We can use the rate law to directly determine coefficients in the balanced equation.
B) From the rate law we can evaluate potential reaction mechanisms.
C) The rate law gives us a good indication of the thermodynamic stability of the products.
D) The rate law can lead us to determine the equilibrium constant for the reaction.
E) None of these.