Identify the polymer obtained from the copolymerization of $CH_2=CH-CN$ (acrylonitrile) and $CH_2=CH-CH=CH_2$ ($1$,$3$-butadiene).

  • A
    Polyacrylamide
  • B
    Buna-$N$
  • C
    Glyptal
  • D
    Perspex

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