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Dehydration synthesis involves the reaction of two small molecules to form a large molecule with the loss of water. In biology, large macromolecules, crucial for the survival of an organism, such as carbohydrates, proteins, nucleic acids, and lipids are synthesized by a dehydration reaction.

Monomers are the basic building blocks for the formation of polymers. Monomers combine to form polymers by dehydration synthesis reaction. Hence, option a is incorrect.

Dehydration synthesis is a reaction between two monomers to form polymers. The hydroxy group of one monomer combines with the hydrogen atom from another monomer to form a covalent bond between the monomers and release a water molecule. Hence, option b is incorrect.

Dehydration synthesis is important as it leads to the formation of biological macromolecules that play a critical role in the functioning of the cell. Two monomers combine to form a covalent bond between them and a water molecule is released. The addition of monomers via multiple dehydration synthesis reactions releases water at every step. This growing chain of monomer units begins to form a polymer. Hence, option c is correct.