The structures of some important polymers are given. Which one represents Buna-$S$?
- A$-(CH_2-C(CH_3)=CH-CH_2)_n-$
- B$-(CH_2-CH=CH-CH_2-CH(C_6H_5)-CH_2)_n-$
- C$-(CH_2-CH=CH-CH_2-CH(CN)-CH_2)_n-$
- D$-(CH_2-C(Cl)=CH-CH_2)_n-$
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