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Considering the basic strength of amines in aqueous solution, which one has the smallest pKb value ?

(a) $\left({\mathrm{CH}}_{3}{\right)}_{2}\mathrm{NH}$

(b) ${\mathrm{CH}}_{3}{\mathrm{NH}}_{2}$

(c) $\left({\mathrm{CH}}_{3}{\right)}_{3}\mathrm{N}$

(d) ${\mathrm{C}}_{6}{\mathrm{H}}_{5}{\mathrm{NH}}_{2}$