Identify the monomers used in the preparation of $Dacron$.

• A
  $C_6H_5OH$ and $CH_2O$
• B
  $H_2C=CH-CH=CH_2$ and $H_2C=CH-CN$
• C
  $HO-CH_2-CH_2-OH$ and $HOOC-C_6H_4-COOH$ (Ethylene glycol and terephthalic acid)
• D
  $H_2C=CH-CN$ and $C_6H_5OH$