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In Friedel-Craft's synthesis of toluene, the reactants in addition to anhydrous ${\mathrm{AlCl}}_{3}$ are

(a)

(b) ${\mathrm{C}}_{6}{\mathrm{H}}_{5}\mathrm{Cl}$ + ${\mathrm{CH}}_{3}\mathrm{Cl}$

(c) ${\mathrm{C}}_{6}{\mathrm{H}}_{6}$ + ${\mathrm{CH}}_{4}$

(d) ${\mathrm{C}}_{6}{\mathrm{H}}_{6}$ + ${\mathrm{CH}}_{3}\mathrm{Cl}$