The Stoichiometry of a Reaction Tells Us Which of the Following

The stoichiometry of a reaction tells us which of the following?

A) The rate at which a reaction occurs.
B) The amount of energy liberated during the course of a reaction.
C) The number of steps from which an overall reaction, from reactants to products, is formed.
D) The amount of energy required to initiate a reaction.
E) The relative quantities of reactants and products associated with a particular reaction.