The reactant that can complete the equation is Option C
What is addition reaction?
A chemical reaction known as an addition reaction occurs when two or more reactants come together to form a single product. The main feature of addition reactions is the addition of individual or groups of atoms to a molecule without removing any atoms from the reactants. Elimination reactions, on the other hand, remove elements from the reactants.
Addition reactions are widespread in organic chemistry and play a crucial role in the synthesis of various compounds.