The most abundant protein in the animal world is

The correct option is C Collagen

Collagen is a fibrous protein which provides structural support to the cell and it is one of the most abundant protein in the animal kingdom. It occupies almost 50% of the animal protein and provides strength and rigidity. It forms an integral component of the extracellular matrix of the connective tissues.

It has a triple helix which has two identical chains of amino acid and an additional chain which is slightly different in structure. It has a quaternary structure. It is a multiple folded protein. It contains three polypeptide chain coiled together and stabilized by chemical bonds like H-bonds, ionic bonds, and hydrophobic bonds.

So, the correct answer is option C.