Name the tissue that lines the inner lining of the mouth.

Squamous epithelium lines the inner lining of the mouth.

Tissues are formed by groups of cells that perform a specific function. There are different types of tissues in the body that perform different functions. 
-The epithelial tissues are the tissues that forms the covering on all internal and external surfaces of human body. They line body cavities and hollow organs and are the major tissue in glands.
They are of four types - squamous, cuboidal, columnar, and stratified.

Squamous epithelium typically lines blood vessels and body cavities including that of alimentary canal.

The other options like connective tissues include blood and bone, and muscle tissue and nervous tissue form the muscles and nervous system respectively.