A Study of the Decomposition Reaction 3RS₂ → 3R

A study of the decomposition reaction 3RS₂ → 3R + 6S yields the following initial rate data. [RS₂](mol L^-1) Rate (mol/(L·s) )
0) 150 0.0394
0) 250 0.109
0) 350 0.214
0) 500 0.438
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