Final answer:
The molar heat of neutralization is an exothermic process where heat is released during the reaction.
Step-by-step explanation:
The molar heat of neutralization is a measure of the heat released or absorbed when one mole of a substance reacts with an acid or a base to form water and a salt. It is typically exothermic, meaning that heat is released during the reaction. The amount of heat released is dependent on the specific reaction and can vary. Therefore, the correct option is A. Exothermic process.