The OH Radical Disproportionates According to the Elementary Chemical Reaction $\rightarrow$

The OH radical disproportionates according to the elementary chemical reaction OH + OH $\rightarrow$ H₂O + O. This reaction is second order in OH. The rate constant for the reaction is 2.2 *10^-12 cm³/molecule • s at room temperature. If the initial OH concentration is 1.8 *10¹³ molecules/cm³, what is the first half-life for the reaction?

A) 3.2*10¹¹ s
B) 0.025 s
C) 4.1 * 10²⁴ s
D) 3.7 s
E) 5.1 s