Final answer:
Nonkeratinized stratified squamous epithelium lines the mouth, esophagus, and vagina, but not the small intestine which has simple columnar epithelium. The correct option is B.
Step-by-step explanation:
Nonkeratinized stratified squamous epithelium is found lining several parts of the body where protection against abrasion is necessary without the need for keratin's tough, water-resistant properties. This type of epithelium provides protection in moist areas such as the mouth, esophagus, and vagina.
However, it is not found in the small intestine. The epithelium in the small intestine is a simple columnar epithelium, specialized for absorption and secretion, and is different from the nonkeratinized stratified squamous epithelium.