Which plastic is noted for its low stiffness and used in carrier bags?

The correct answer is noted for its low stiffness and flexibility, making it particularly suitable for applications such as carrier bags. Low-Density Polyethylene (LDPE) is known for its lightweight and pliable nature, allowing it to be easily formed into various shapes. This characteristic is essential for carrier bags, as they need to be capable of holding items without tearing easily while also being flexible enough for easy handling and storage.

In addition, LDPE offers good resistance to chemicals and moisture, which enhances its suitability for carrying a variety of goods. Its properties make it a popular choice for shopping bags and other flexible packaging solutions. Other options, such as High-Density Polyethylene (HDPE) and the other materials listed, have different structural characteristics that do not provide the same degree of flexibility and softness required for carrier bags.