The Mechanism for the Reaction 2 H₂O₂(aq) $\to$ 2 H₂O( )+ O₂(g)in the Presence of I^-(aq)is Proposed

The mechanism for the reaction 2 H₂O₂(aq) $\to$ 2 H₂O( ) + O₂(g) in the presence of I^-(aq) is proposed to be: Step 1: H₂O₂(aq) + I^-(aq) $\to$ H₂O( ) + OI^-(aq) $\quad$ $\quad$ $\quad$ (slow)
Step 2: H₂O₂(aq) + OI^-(aq) $\to$ H₂O( ) + O₂(g) + I^-(aq) $\quad$ $\quad$ (fast)
What is the molecularity of the rate-determining step?

A) zeromolecular
B) unimolecular
C) bimolecular
D) termolecular
E) More information is needed to answer this question.