For a first order reaction, (A)→Product, the concentration of A changes from 0.1M to 0.025M in 40 minutes. The rate of reaction when the concentration of A is 0.01M, is:

(A) 1.73×10⁻⁵Mmin⁻¹
(B) 3.47×10⁻⁴Mmin⁻¹
(C) 3.47×10⁻⁵Mmin⁻¹
(D) 1.73×10⁻⁴Mmin⁻¹