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Among the following surfactant molecules, the surfactant that forms micelles in aqueous solution at the lower CMC at ambient condition is:

(a) ${\mathrm{CH}}_{3}{\left({\mathrm{CH}}_{2}\right)}_{15}{\mathrm{N}}^{+}{\left({\mathrm{CH}}_{3}\right)}_{3}{\mathrm{Br}}^{-}$

(b) ${\mathrm{CH}}_{3}{\left({\mathrm{CH}}_{2}\right)}_{11}{\mathrm{OSO}}_{3}^{-}{\mathrm{Na}}^{+}$

(c) ${\mathrm{CH}}_{3}{\left({\mathrm{CH}}_{2}\right)}_{6}{\mathrm{COO}}_{}^{-}{\mathrm{Na}}^{+}$

(d) ${\mathrm{CH}}_{3}{\left({\mathrm{CH}}_{2}\right)}_{11}{\mathrm{N}}^{+}{\left({\mathrm{CH}}_{3}\right)}_{3}{\mathrm{Br}}^{-}$