A Study of the Decomposition Reaction 3RS₂ → 3R

A study of the decomposition reaction 3RS₂ → 3R + 6S yields the following initial rate data. What is the rate constant for the reaction?

A) 0.0103 L mol ⁻¹s ⁻¹
B) 0.263 L mol ⁻¹s ⁻¹
C) 0.571 L mol ⁻¹s ⁻¹
D) 1.17 L mol ⁻¹s ⁻¹
E) 1.75 L mol ⁻¹s ⁻¹