Synthetic rubbers are made by polymerisation of_x000D_ 1.Chloroprene_x000D_ 2.Styrene butadiene mixture_x000D_ 3.Isobutylene_x000D_ Select the correct answer using the above codes:

• A. 1 and 3
• B. 2 only
• C. 1,2 and 3
• D. 3 only