Answer : The correct option is, (B) 
Explanation :
Balanced chemical reaction : It is defined as the number of atoms of individual elements present on reactant side must be equal to the product side.
The balanced chemical reaction will be,
By the stoichiometry, we can say that 2 moles of
react with 1 mole of
to give 1 moles of
and 1 mole of
.
In this reaction,
and
are the reactants and
and
are the products.
Hence, the correct option is, (B) 