The First-Order Rate Constant for the Decomposition of Trioxane (C₃H₆O₃)

The first-order rate constant for the decomposition of trioxane (C₃H₆O₃) is known to be 3.05 x 10^-4 s^-1 at 519ºK. What is the half life of trioxane at 519ºK?

A) 3.28 x 10³ s
B) 6.93 x10³ s
C) 0.693 hour
D) 0.631 hour
E) 0.328 hour