Histamine, a Vasodilator, Is Responsible for a Wide Variety of Physiological

Histamine, a vasodilator, is responsible for a wide variety of physiological effects. Rank the three nitrogen atoms in histamine in increasing order of basicity, putting least basic nitrogen atom first.

A) N2 < N1 < N3
B) N1 < N2 < N3
C) N3 < N1 < N2
D) N3 < N2 < N1