The correct options are
B Acrylic
C Polyester
D Nylon
The substances which are obtained from petroleum and natural gas are called petrochemicals. Petrochemicals are used in the manufacture of detergents, synthetic fibres, plastics etc.
Synthetic fibres are long chains of polymers which are made from derivatives of petroleum and natural gas. Nylon, polyester and acrylic are examples of synthetic fibres whereas silk is a natural fibre.