Final answer:
The epithelial tissue is responsible for lining vessels inside the body and for functioning as the skin covering the body. The correct option is A.
Step-by-step explanation:
The kind of tissue that serves as a lining for vessels inside the body and as skin that covers the body is epithelial tissue. Epithelial tissue, also known as epithelium, primarily functions as a covering or lining of body parts and has roles in protection, absorption, transport, and secretion.
This includes both the outer covering of the body (skin) and the lining of internal passageways that communicate with the external environment such as the lining of the digestive and respiratory tracts.
The epithelial tissue forms large sheets of cells that cover all the body surfaces and also line the outside of organs and blood vessels, and the insides of cavities in hollow organs. Other tissue types include connective tissue, which connects and supports parts of the body; muscle tissue, which enables movement; and nervous tissue, which transmits signals.