Answer : The correct option is, (b) as the reaction occurs OH and H are removed.
Explanation :
Dehydration synthesis reaction : It is a type of condensation reaction in which the two functional groups combined to form a covalent bond with release water molecule as a byproduct.
Or, we can say that when two smaller molecule combine with covalent bonds then it forms a larger molecule with release water molecule as a byproduct.
From this we conclude that, the option A and D are incorrect option because in this water is added during the reaction. The option C is also incorrect option because in this molecules are breaks in the reaction.
So, the correct option is C because in this OH and H are removed in the reaction that means water is release in this reaction.
Hence, the correct option is, (b) as the reaction occurs OH and H are removed.