The starting substances in a chemical reaction are called reactants.
• A process, which results in the chemical transformation of one set of chemical substances to another is known as a chemical reaction.
• The substances or substance, which at the start takes part in a chemical reaction are known as reagents or reactants.
• The chemical reactions are generally featured by a chemical change, and they produce one or more products that generally exhibit distinct characteristics from the reactants.
Thus, the correct answer is option c, that is, reactants.
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