When equal volumes of four ${\text{0.1 mol}}\,{\text{d}}{{\text{m}}^{ - 3}}$ solutions are arranged in order of increasing pH (lowest pH first), what is the correct order?

A.     ${\text{C}}{{\text{H}}_{\text{3}}}{\text{COOH}} < {\text{HN}}{{\text{O}}_{\text{3}}} < {\text{C}}{{\text{H}}_{\text{3}}}{\text{C}}{{\text{H}}_{\text{2}}}{\text{N}}{{\text{H}}_{\text{2}}} < {\text{KOH}}$

B.     ${\text{HN}}{{\text{O}}_{\text{3}}} < {\text{C}}{{\text{H}}_{\text{3}}}{\text{COOH}} < {\text{C}}{{\text{H}}_{\text{3}}}{\text{C}}{{\text{H}}_{\text{2}}}{\text{N}}{{\text{H}}_{\text{2}}} < {\text{KOH}}$

C.     ${\text{C}}{{\text{H}}_{\text{3}}}{\text{C}}{{\text{H}}_{\text{2}}}{\text{N}}{{\text{H}}_{\text{2}}} < {\text{HN}}{{\text{O}}_{\text{3}}} < {\text{C}}{{\text{H}}_{\text{3}}}{\text{COOH}} < {\text{KOH}}$

D.     ${\text{KOH}} < {\text{C}}{{\text{H}}_{\text{3}}}{\text{C}}{{\text{H}}_{\text{2}}}{\text{N}}{{\text{H}}_{\text{2}}} < {\text{C}}{{\text{H}}_{\text{3}}}{\text{COOH}} < {\text{HN}}{{\text{O}}_{\text{3}}}$

B