What type of tissue makes up the endothelium of capillaries?

In capillaries, the outer tunics of smooth muscle cells are absent and only the endothelium is present. Capillaries are often invested in pericapillary contractile cells called pericytes. The layer of endothelial cells is a type of epithelium and is bounded at its outer surface by a basement membrane.

it's not c. i took the quiz and got it wrong. so my best guess is b.

have a great day, and hope this .

im not intirely sure but i think the anwser is d relative humidity