$5.$ Which statement is true regarding the experimental determination of a rate law?

A$)$ In order to determine the value of an exponent for a reactant in the rate law, the concentration

of that reactant and one other reactant must be changed.

B$)$ The instantaneous rate at the midway point of the reaction is used to determine the exponents

and rate law for that equation.

C$)$ The initial rates of the reaction when the concentration of one reactant is varied and the

remaining reactants are unchanged are used to determine the value of the exponents for the

reactants in a rate law.

D$)$ The average rate of reaction at the midway point of the reaction is used to determine the

exponents and rate law for that equation.