Nitramide decomposes to nitrous oxide in aqueous solution: NH2NO2(aq) ® N2O(g) + H2O(l) In solutions — Kinetics Chemistry Question

Nitramide decomposes to nitrous oxide in aqueous solution:
NH₂NO₂(aq) ® N₂O(g) + H₂O(l)
In solutions with pH ≥ 12, the rate law for this reaction is:
Rate = k [NH₂NO₂] / [H₃O⁺]
The reaction is monitored with pH = 12.0 (solid line) and with pH = 12.3 (dashed line). Which graph best represents the time-dependence of the nitramide concentrations in the two experiments?