Nylon -66 is a polyamide of a

Question

$\begin {array} {1 1} (A)\;\text{vinyl chloride and formaldehyde} & \quad (B)\;\text{adipic acid and methylamine} \\ (C)\;\text{adipic acid and hexamethelene diamine} & \quad (D)\;\text{formaldehyde and melenine} \end {array}$