In a Lab Setting, Heating a Vessel Full of Reactants

In a lab setting, heating a vessel full of reactants will generally

A) increase the kinetic energy of the molecules and increase the reaction rate.
B) raise the activation energy and catalyze the reaction.
C) lower the activation energy and the kinetic energy of the reactants.
D) convert products to reactants by increasing the energy requirements.
E) lower the reaction rate due to the change in structure of the reactants.