**Core Concept**
Plummer-Vinson syndrome is a rare condition characterized by dysphagia, iron-deficiency anemia, and esophageal webs. The pathophysiology involves chronic iron deficiency leading to mucosal atrophy and webs formation in the esophagus.

**Why the Correct Answer is Right**
The correct answer is related to the formation of esophageal webs, which are thin membranes of tissue that can partially or completely obstruct the esophagus. These webs are thought to be caused by the chronic inflammation and mucosal atrophy of the esophagus due to iron deficiency. The exact mechanism is not fully understood, but it is believed to be related to the decreased production of mucin and the formation of scar tissue.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to the pathophysiology of Plummer-Vinson syndrome. While esophageal spasms can cause dysphagia, they are not a characteristic feature of this syndrome.
**Option B:** This option is incorrect because the condition is not primarily related to a motor disorder of the esophagus. While some patients may experience esophageal motility disorders, this is not the primary cause of dysphagia in Plummer-Vinson syndrome.
**Option C:** This option is incorrect because the condition is not primarily related to a neurological disorder. While some patients may experience neurological symptoms, the primary cause of dysphagia in Plummer-Vinson syndrome is related to the formation of esophageal webs.

**Clinical Pearl / High-Yield Fact**
A key clinical feature of Plummer-Vinson syndrome is the presence of esophageal webs, which can be visualized on barium swallow studies or endoscopy. This is an important diagnostic clue, as the condition can be distinguished from other causes of dysphagia.

**Correct Answer:** C. Esophageal webs