**Core Concept**
The incipient carious lesion on an interproximal surface is usually located in a specific area due to the unique characteristics of enamel and dentin in that region. The location is determined by the anatomy of the tooth and the presence of specific bacteria.

**Why the Correct Answer is Right**
The correct location of the incipient carious lesion is typically on the proximal surface of the tooth, between the gingival margin and the contact area. This is because the enamel on the proximal surfaces is thinner and more susceptible to acid erosion due to the presence of Streptococcus mutans and other bacteria that thrive in the oral cavity. The constant flow of saliva and the presence of fluoride also contribute to the higher incidence of caries in this area.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the location of the incipient carious lesion is not typically at the occlusal surface, which is more resistant to caries due to the thicker enamel.
* **Option B:** This option is incorrect because the location of the incipient carious lesion is not typically on the buccal or lingual surface, which are less susceptible to caries due to the presence of saliva and the anatomy of the tooth.
* **Option C:** This option is incorrect because the location of the incipient carious lesion is not typically at the gingival margin, which is more resistant to caries due to the presence of keratinized epithelium and the flow of saliva.

**Clinical Pearl / High-Yield Fact**
A key aspect to remember is that interproximal caries often progress more quickly than occlusal caries due to the unique bacterial flora and the anatomy of the tooth. Regular recall and radiographic examination of interproximal surfaces are essential for early detection and prevention of caries.

**Correct Answer:** C.