Both Chlorine and Bromine Can Be Produced in the Laboratory

Both chlorine and bromine can be produced in the laboratory by reacting the halides with manganese(IV) oxide.If the following equation is balanced in an acidic solution,then the MnO₂ is acting as a(n) ________ and the coefficient in front of H⁺ is ________.
____ MnO₂(s) + ____ Cl^-(aq) + ____ H⁺(aq) → ____ Mn²⁺(aq) + ____ Cl₂(g) + ____ H₂O(l)

A) oxidizing agent,2
B) oxidizing agent,3
C) oxidizing agent,4
D) reducing agent,3