What type of protein is a collagen?

Fibrous protein
Collagen is the major insoluble fibrous protein in the extracellular matrix and in connective tissue. In fact, it is the single most abundant protein in the animal kingdom. There are at least 16 types of collagen, but 80 – 90 percent of the collagen in the body consists of types I, II, and III (Table 22-3).

Ithink it’s c or b for the answer.