The chain fragment of polymer Z is shown below. This particular section occurs many times in the chains of polymer Z, but it is not the repeat unit. $-\text{CH}_2-\text{CHCl}-\text{CH}_2-$ What might polymer Z be called?
- A1, 2 and 3 are correct
- B1 and 2 only are correct
- C2 and 3 only are correct
- D1 only is correct