**Core Concept**
The core concept being tested here is the potential complication of mask ventilation, specifically the compression of a critical anatomical structure due to excessive pressure application. This is related to the anatomy and physiology of the airway, particularly the relationship between the mask, the face, and the underlying structures.

**Why the Correct Answer is Right**
The correct answer is related to the compression of the **submandibular gland** or the **sublingual gland**, but more likely the **submandibular gland**. When heavy pressure is applied during mask ventilation, it may compress the submandibular gland, which is located beneath the mandible (lower jawbone). This compression can lead to swelling, discomfort, and potentially even compromise the airway. The submandibular gland plays a crucial role in saliva production, and its compression can affect the overall airway management during mask ventilation.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not a relevant anatomical structure related to mask ventilation or compression.
* **Option B:** This option is a distractor, as it is not a structure that would be compressed during mask ventilation.
* **Option C:** This option is not a correct answer, as it is not related to the submandibular gland or the potential complications of mask ventilation.

**Clinical Pearl / High-Yield Fact**
When performing mask ventilation, it is essential to maintain a gentle, even pressure to avoid compressing the submandibular gland or other underlying structures. This can be achieved by using a mask with a soft, pliable design and applying gentle, consistent pressure.

**Correct Answer: B. Submandibular gland.**