Final answer:
Stomatitis is the inflammation of the mouth, involving sores or lesions arising within the oral cavity. So for the given question the correct option will be option A among the given options.
Step-by-step explanation:
The term stomatitis refers to inflammation of the mouth. This condition can manifest as sores, cankers, or lesions within the oral cavity. It is vital to understand that the mouth, also known as the oral cavity or buccal cavity, is the first organ of the gastrointestinal (GI) tract where both mechanical as well as chemical digestion of carbohydrates and fats begin. The mouth features several specialized structures for digestion, including salivary glands, the tongue, and teeth. While the pharynx and esophagus are part of the alimentary canal, moving food from the mouth to the stomach, they are not directly involved in the inflammation that is referred to as stomatitis.