Question 2
Epithelial tissue has no blood supply. How is it nourished?
The right answer is the one marked above.
By diffusion through the basement membrane. Nutrients reach the tissue from the connective tissue underneath, which is why an epithelium can only be a few layers thick.
A capillary running inside a lining would be a hole in the barrier. Being avascular is not a limitation of epithelium — it is a condition of the tissue doing its job.