A Certain Membrane Has a Diffusion Constant D = 1 $\times$

Multiple Choice

A certain membrane has a diffusion constant D = 1.00 $\times$ 10^-11 m²/s and a thickness of 1.00 $\times$ 10^-6 m.The area of the membrane is 5.00 m².If the difference in the concentration across the membrane is 2.44 atoms/m³,then the rate of particles diffusing through the membrane is

A) 1.05 $\times$ 10²¹ s^-1.
B) 1.22 $\times$ 10²¹ s^-1.
C) 2.03 $\times$ 10²¹ s^-1.
D) 2.83 $\times$ 10²¹ s^-1.
E) 3.27 $\times$ 10²¹ s^-1.