What is the common origin of wool, cotton, silk, and linen in textile design?

The correct choice highlights that wool, cotton, silk, and linen are all classified as natural fibers. Natural fibers are derived from plants or animals, which distinguishes them from synthetic fibers that are chemically manufactured. Wool comes from sheep and is an animal-derived fiber; cotton is sourced from the cotton plant's fibers; silk is produced by silkworms, further representing an animal origin; and linen is made from the flax plant.

By grouping these fibers under the umbrella of natural fibers, it emphasizes their shared origin in nature as opposed to artificial or synthetic materials. This terminology is often used in textile design to articulate the differences in material properties, sustainability, and overall impact on the environment. Understanding natural fibers is crucial in interior design, where different textures and sustainability considerations come into play when selecting materials for various applications.