Reactions can be reversible and irreversible. The reversible reactions can proceed in either direction. Thus, option A is correct.
What are reversible reactions?
Reversible reactions can convert the reactants and products into each other and hence, move in both the left and right directions. These types of reactions never get completed and attain equilibrium.
The reactants react to produce the products, and the products re-react to form the reactants of the reaction mixture. The melting of the wax can be a reversible reaction.
Therefore, option A. reversible reactions can occur in both directions is correct.
Learn more about the reversible reaction here:
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