The following is a second-order reaction. (a → product) if (k = 0.00671 , m⁻¹ , min⁻¹) and the initial concentration of (a) is (0.850 , m), how long will it take for the concentration of (a) to be (0.350 , m)?

a) 35.4 minutes
b) 89.6 minutes
c) 126.5 minutes
d) None of the above