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

The OH· radical disproportionates according to the elementary chemical reaction This reaction is second order in OH·.The rate constant for the reaction is 2.0 $\times$ 10^-12 cm³/molecules at room temperature.If the initial OH concentration is 1.3 $\times$ 10¹³ molecules/cm³,what is the first half-life for the reaction?

A) 3.5 $\times$ 10¹¹ s
B) 2.6 $\times$ 10¹ s
C) 3.8 $\times$ 10^-2 s
D) 7.7 $\times$ 10^-14 s
E) 1.9 $\times$ 10^-2 s