A General Reaction Written as 2A + 2B $\rightarrow$ C + 2D Is Studied and Yields the Following Data

A general reaction written as 2A + 2B $\rightarrow$ C + 2D is studied and yields the following data.
-What are the proper units for the rate constant for the reaction?

A) L mol^-1 s^-1
B) s^-1
C) L³ mol^-3 s^-1
D) mol L^-1 s^-1
E) L² mol^-2 s^-1