Answer: Option (D) is the correct answer.
Explanation:
A synthesis reaction is defined as the reaction in which two molecules or atoms combine together to result in the formation of a compound.
For example, , is a synthesis reaction.
Decomposition reaction is a reaction in which a reactant or substance breaks into two or more substances.
For example, , is a decomposition reaction.
In a single replacement reaction, an element replaces one atom from a compound.
For example,
Thus, we can conclude that the chemical equation represent synthesis reaction.