The rate-law expression for the reaction 2N2O5 (g) → 4NO2(g) + O2(g) is found to be Rate=kc[N2O5], what is its half-life time?(k= 1.2×10-2 s-1at 45℃)
A、57.75 s
B、166 s
C、5.775 s
D、100 s