The First-Order Reaction A $\to$ B Has K = 5

The first-order reaction A $\to$ B has k = 5.67 s^-1.If [A]₀ = 0.500 M,how long will it take [A] = 0.124 M ?

A) 0.122 s
B) 0.100 s
C) 8.18 s
D) 0.246 s
E) 0.488 s