Final answer:
Scar tissue mainly consists of collagen fibers produced by fibroblasts during the healing process. While other cells and elements are involved in healing, they do not become the primary component of the scar.
Step-by-step explanation:
Scar tissue primarily consists of collagen fibers. During the healing process, fibroblasts from the surrounding connective tissues produce collagen, which replaces the collagen and extracellular material lost by the injury. Angiogenesis, the growth of new blood vessels, facilitates the formation of granulation tissue; however, as healing progresses, the capillaries in the granulation tissue decrease and a pale scar forms. This scar is composed of dense bundles of collagen fibers, which gives scars their characteristic appearance.
While epithelial cells, new capillaries, and smooth muscle fibers also play roles in healing, they are not the primary make-up of scar tissue. Epithelial cells can regenerate the epidermis, and new capillaries increase blood circulation to aid the healing process, but neither becomes the main component of the scar. Thus, the correct answer to the question is c. collagen fibers.