Final answer:
Option A is the correctly balanced chemical equation.
Step-by-step explanation:
The correctly balanced chemical equation is option A.
A balanced chemical equation has the same number of each type of atom on both sides of the equation.
In option A, the equation is balanced because there are 2 iron atoms on the left side and 2 on the right side, 6 hydrogen atoms on the left side and 6 on the right side, 6 sulfur atoms on the left side and 6 on the right side, and 12 oxygen atoms on the left side and 12 on the right side.