Aforward reaction in which adding heat decreases product formation is while a forward reaction in which adding heat increases product formation
a.) exothermic, endothermic
b.) irreversible, reversible
c.) endothermic, exothermic
d.) none of the above

I believe the correct answer from the choices listed above is option A. A forward reaction in which adding heat decreases product formation is exothermic, while a forward reaction in which adding heat increases product formation is endothermic. Exothermic would mean that heat is being released by the process while the opposite is called endothermic in which it absorbs heat.

D-no effect on the rate