The Rate Constant of a First-Order Decomposition Reaction Is 0 $\times$

The rate constant of a first-order decomposition reaction is 0.0147 s^-1.If the initial concentration of reactant is 0.178 M,what is the concentration of reactant after 30.0 seconds?

A) 8.72 $\times$ 10⁵ M
B) 0.0645 M
C) 0.115 M
D) 0.0785 M
E) 0.643 M