The correct option is A They are classified on the basis of their growth pattern
The structure of cells differs based on their function. Hence they are classified into four types based on their location and function viz., epithelial tissue, connective tissue, muscular tissue and nervous tissue.
One or more morphologically similar cells that perform a common function is called a tissue. It is found in all vertebrates and also seen in some invertebrates. The study of tissues is called histology.