**Core Concept**
The oral cavity is a common site for premalignant lesions, which are abnormal tissue changes that may progress to cancer. These lesions can be caused by various factors, including chronic irritation, infection, and genetic predisposition.

**Why the Correct Answer is Right**
The correct answer is a condition that does not have a known potential for malignant transformation. One such condition is **Leukoplakia with dysplasia** is a premalignant lesion, but Leukoplakia without dysplasia, also known as **Homogeneous Leukoplakia**, is generally considered to be a non-progressive lesion and is not considered premalignant. This is because homogeneous leukoplakia typically does not show significant cellular atypia and has a low risk of malignant transformation.

**Why Each Wrong Option is Incorrect**
**Option A:** **Erythroplakia** is a premalignant lesion of the oral cavity, characterized by red, atrophic patches that often show dysplasia and have a high risk of malignant transformation.
**Option B:** **Submucous Fibrosis** is a chronic condition that can lead to malignant transformation, particularly if left untreated. It is characterized by fibrosis of the oral mucosa and can cause pain and stiffness of the mouth.
**Option C:** **Lichen Planus** is a mucocutaneous disease that can have a variant known as **Oral Lichen Planus**, which has a small risk of malignant transformation, especially in cases of long-standing disease.
**Option D:** **Necrotizing Ulcerative Gingivitis (NUG)**, also known as **Trench Mouth**, can be a premalignant lesion in rare instances.

**Clinical Pearl / High-Yield Fact**
It's essential to differentiate between homogeneous leukoplakia and leukoplakia with dysplasia, as the latter has a higher risk of malignant transformation and requires closer monitoring and treatment.

**Correct Answer:** C.