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Buna-S is a synthetic rubber, which is a copolymer of 1,3-butadiene and styrene. The name "Buna-S" is derived as follows:
"Bu" stands for butadiene, "na" stands for sodium (Na) which is used as a catalyst in the polymerisation, and "S" stands for Styrene, the comonomer used along with butadiene.
The correct answer is Option (4): Styrene.
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