Which of the following represents a process of creating textiles by matting fibers?

Felting is a textile process that involves matting, condensing, and pressing fibers together to create a dense and durable fabric. This technique typically uses natural fibers such as wool, which, when exposed to heat, moisture, and agitation, become entangled and bonded. As the fibers interlock through mechanical and thermal actions, they form a solid material without the need for weaving or knitting.

The other options represent different techniques or processes. Embroidery is a decorative stitching technique applied to the surface of a fabric, rather than a method of creating fabric itself. Knitting involves interlocking loops of yarn with needles to create a fabric but does not involve matting fibers in the same way that felting does. Lost wax casting is a method used in metalworking, particularly in creating sculptures, and is entirely unrelated to textile creation. Thus, felting is the correct choice for representing the process of creating textiles through matting fibers.