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# Which one of the following is not a surfactant ?

$\qquad(b)\;CH_{3}-(CH_{2})_{14}-CH_{2}-NH_{2}\qquad(c)\;CH_{3}-(CH_{2})_{16}-CH_{2} OSO_{2}^{-}Na^{+}\qquad(d)\;OHC-(CH_{2})_{14}-CH_{2}-COO^{-}Na^{+}$