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

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

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