Which coefficients would balance this equation?

__ ${\text{Mn}}{{\text{O}}_2} +$ __ ${\text{HCl}} \to$ __ ${\text{MnC}}{{\text{l}}_2} +$ __ ${\text{C}}{{\text{l}}_2} +$ __ ${{\text{H}}_2}{\text{O}}$

C

In spite of a concern on the part of one teacher that this question was too difficult, this was one of the questions that students found easiest, with a Difficulty Index of 94%; hence it provided a nice easy start to settle students into the paper.