What Statement Accurately Describes the Structure of the Tunica Intima

What statement accurately describes the structure of the tunica intima layer of a cardiac blood vessel?

A) This layer is composed of connective tissues and nerve cells, as well as nutrient capillaries in larger vessels.
B) This layer contains the thickest elastic fibers, as well as connective tissue composed of polysaccharides.
C) This layer protects the outside of the vessel.
D) This layer is the thinnest-a single layer of simple squamous endothelium held together by an intercellular matrix.