The amount of iodine in a solution can be determined by a redox method using a sulfite

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The amount of iodine in a solution can be determined by a redox method using a sulfite solution. 

I2(s) + SO3 2–(aq) + H2O(l) → 2 I(aq) + SO4 2–(aq) + 2 H+(aq) 

Indicate each of the following for the preceding reaction:

(a) Substance oxidized

(b) Substance reduced

(c) Oxidizing agent

(d) Reducing agent.

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