Which one of the following forms micelles in aqueous solution above a certain concentration?

Glucose

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Urea

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Dodecyltrimethyl ammonium chloride

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Pyridinium chloride

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Solution

The correct option is C Dodecyltrimethyl ammonium chloride
A micelle is an aggregate of surfactant molecules dispersed in a liquid colloid. Among all given compounds, urea and glucose are polar molecules and pyridinium chloride is ionic molecule so they all dissolve in water.
But dodecyldimethylethyl ammonium bromide and dodecyl trimethyl ammonium chloride in aqueous media in the presence of diclofenac sodium forms micelle due to their structure.

Hence, the correct option is $C$

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