For the reaction 2 NO(g) + O₂(g) → 2 NO₂(g), the rate law is:

(a) Rate = k[NO]²[O₂], the orders coming from the stoichiometric coefficients of the balanced reaction.

(b) Rate = k[NO]^x[O₂]^y, where orders x and y must be determined by doing kinetics experiments.

(c) Rate = k[NO]^x + [O₂]^y, where orders x and y must be determined by doing kinetics experiments.

(d) Rate = k[NO]²[O₂][NO₂]².