Calculate the Rate Constant for the Rate-Determining Step of a Diffusion-Controlled

Calculate the rate constant for the rate-determining step of a diffusion-controlled reaction that takes place in toluene, C₆H₅CH₃, at 20 °C. The viscosity of toluene at this temperature is $\eta$ = 5.85 *10^-4 kg m^-1 s^-1.

A) 253 * 10³ mol^-1 m³ s^-1
B) 3.70 *10⁶ mol^-1 m³ s^-1
C) 758*10³ mol^-1 m³ s^-1
D) 11.1 *10⁶ mol^-1 m³ s^-1