Chlorine Dioxide (ClO₂) Is Used as a Disinfectant in Municipal

Chlorine dioxide (ClO₂) is used as a disinfectant in municipal water-treatment plants. It decomposes in a first-order reaction with a rate constant of 0.0714 s^-1. If the initial concentration were 0.12 M, what would the concentration be after 14.0 s has elapsed?

A) 0.033 M
B) 0.12 M
C) 0.060 M
D) 0.012 M
E) 0.044 M