Answer: Option (A) is the correct answer.
Explanation:
A balanced equation is defined as the equation which contains same number of atoms on both reactant and product side.
For example, 
Here, no. of atoms on reactant side are as follows.
No. of atoms on product side are as follows.
As the number of atoms on both reactant and product side are same in this reaction equation. Hence, it is a balanced reaction equation.
Thus, we can conclude that
equations is balanced.