The correct option is D Blended fibers
Blended fibers are manufactured from a mixture of two or more different type of fibers. Mixing fibers allows manufactures to form new textile yarns with distinct advantages. Each fiber retains its separate set of physical and aesthetic characteristics inherent in its design but the fabric acquires new characteristics depending on the type and percent of fibers used. Blends utilize the advantages of all the fibers to counteract the disadvantages of a single fiber. Synthetic fibers can be blended with natural fibers to create a material that is stronger, but more comfortable.