Answer:
The right answer to this question is option A. Epithelial
Step-by-step explanation:
An Epithelial tissue has both the characteristics mentioned in the question, it's so tightly packed and regenerative. This kind of tissue is commonly known for the second function, the regeneration, but it contains lots of other functions that can help the organism to work properly, for example, secretion. There's a way to recognize different kinds of epithelial tissues to, and it's by their appearance, being highly related to its location on the body. The most common types of epithelial tissues are simple epithelium and stratified epithelium, both can be found in a single organism depending on the location and what the body needs.