The correct answer is: D) Silk.
Silk is a natural protein fiber that is produced by silkworms. It is one of the strongest natural fibers and is known for its luster and softness. Silk is used to make a variety of products, including clothing, bedding, and upholstery.
Jute is a bast fiber that is obtained from the stem of the jute plant. It is a long, strong fiber that is used to make a variety of products, including burlap, twine, and carpet.
Asbestos is a naturally occurring mineral that is composed of a group of silicate minerals. It is a fibrous material that is resistant to heat and fire. Asbestos was once widely used in construction, but it is now known to be a carcinogen and is no longer used in most countries.
Cotton is a natural fiber that is obtained from the boll of the cotton plant. It is a short, fluffy fiber that is used to make a variety of products, including clothing, bedding, and towels.
Silk is the only natural fiber that is produced by an animal. The other options are all plant-based fibers. Silk is also the only natural fiber that is known for its luster and softness. Jute, asbestos, and cotton are all strong fibers, but they do not have the same luster and softness as silk.