For a New Chemical Reaction Involving Several Reactants, the Order

For a new chemical reaction involving several reactants, the order of reaction with respect to each reactant

A) is easily determined from reactions similar to the one in question
B) may be determined from the coefficient for the respective reactant in the balanced chemical equation
C) must be determined from the rate constant at time = 0
D) must be determined from the overall order of the reaction
E) must be determined experimentally using one or more methods