Which of the Following Statements Regarding the Structure of Blood

Which of the following statements regarding the structure of blood vessels is incorrect?

A) Blood vessels are often found in parallel with lymphatic vessels.
B) Capillaries have only a single layer of endothelium, rendering them fragile and leaky during an infection with a hemorrhagic fever virus.
C) Connective tissue and muscle fibers are found in the layers of tissue surrounding both arteries and veins.
D) In contrast to veins, arteries have higher blood pressure, more tissue layers, and are thinner vessels.