The correct answer is (d). Bakelite is a thermosetting plastic that is made from phenol and formaldehyde. It is a hard, brittle material that is resistant to heat and chemicals. It is used in a variety of applications, including electrical insulation, cookware, and furniture.
P.V.C. is a type of plastic that is made from vinyl chloride. It is a soft, flexible material that is used in a variety of applications, including pipes, windows, and flooring.
Nylon is a type of plastic that is made from polyamides. It is a strong, durable material that is used in a variety of applications, including clothing, ropes, and carpets.
Polystyrene is a type of plastic that is made from styrene. It is a lightweight, foamy material that is used in a variety of applications, including packaging, insulation, and toys.