Final answer:
The term for the reactant that gets completely used up and controls the product amount is the c) limiting reactant.
Step-by-step explanation:
The term used to describe the reactant that is completely used up and controls the amount of product that can be produced during a chemical reaction is the c) limiting reactant. This term is crucial in a chemical process because it determines the maximum amount of product that can be obtained from a reaction. When one reactant is completely consumed, the reaction stops, even though there may be other reactants left over, which are referred to as the excess reactants. Understanding which reactant is limiting is a vital skill for evaluating the conditions of a chemical reaction.