(C) Vulcanisation is a process in which natural rubber is heated with sulfur $(S)$.This process creates cross-links between the polymer chains,which m

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(C) Vulcanisation is a process in which natural rubber is heated with sulfur $(S)$.This process creates cross-links between the polymer chains,which makes the rubber harder,more durable,and less sticky.Therefore,the process of vulcanisation makes rubber hard.The correct option is $(C)$.