Polyethylene is a flexible substance that is used in some plastic bags. The picture shows a model of polyethylene. Why might polyethylene have properties that are useful for plastic bags?A. It is soft because it has a crystal structure similar to salt.B. It is flexible because the hydrogen atoms are a gas that makes the structure flat.C. It is soft and flexible because it is made of carbon, which is hard and holds its shape as a crystal individually.D. It is soft and flexible because it is made of strands of carbon and hydrogen arranged for strength but that bend and slide past each other easily.

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