For the First-Order Reaction 2N₂O₅ $\rarr$ 2N₂O₄ + O₂ at a Particular Temperature, the Half-Life of a Particular

For the first-order reaction 2N₂O₅ $\rarr$ 2N₂O₄ + O₂ at a particular temperature, the half-life of N₂O₅ is 0.90 hr. What fraction of the initial concentration of N₂O₅ will remain after 2.4 hours

A) 0.016
B) 0.16
C) 0.026
D) 0.26
E) None of the above