A follows first order reaction, (A) productConcentration of A, changes from 0.1 M to 0.025 M in 40 minutes. Find the rate of reaction of A when concentration of A is 0.01 M.

A. 1.73 x 10^{-4} M min^{-1} B. 1.73 x 10^{-5} M min^{-1} C. 3.47 x 10^{-5} M min^{-1} D. 3.47 x 10^{-4} M min^{-1}