The answer is: D. Plastic
Paper, wool, wood, and leather are all natural materials. Plastic is a synthetic material.
Paper is made from wood pulp. Wool is made from the hair of sheep. Wood is the hard, fibrous material that makes up the trunks and branches of trees. Leather is made from the skin of animals.
Plastic is a material that is made from oil and other chemicals. It is a man-made material that is not found in nature.
Plastic is a very versatile material. It can be used to make a wide variety of products, including bottles, bags, toys, and furniture. However, plastic is also a major source of pollution. It can take hundreds of years for plastic to decompose, and it often ends up in landfills or in the ocean.
It is important to reduce our use of plastic and to recycle plastic whenever possible. We can also choose to buy products that are made from sustainable materials, such as paper, wool, wood, or leather.