**Core Concept**
The movement of a denture base is influenced by the underlying mucosal support and the distribution of forces exerted on it. In patients with poor ridges, the mucosal support is compromised, and the denture base is more susceptible to movement due to the lack of adequate foundation.

**Why the Correct Answer is Right**
In patients with poor ridges, the denture base experiences greater movement due to the reduced mucosal support. This is because the denture base relies on the mucosa for support and retention, and when the mucosa is compromised, the denture base is more prone to movement. The correct answer is related to the concept of mucosal support and its impact on denture stability.

**Why Each Wrong Option is Incorrect**
**Option A:** Not directly related to the movement of the denture base. While the type of denture material may affect the denture's durability, it does not directly influence the movement of the denture base.
**Option B:** Not relevant to the movement of the denture base. The type of denture clasps may affect the denture's retention, but it does not directly influence the movement of the denture base.
**Option C:** Not directly related to the movement of the denture base. While the presence of a well-fitting denture may affect the distribution of forces, it does not directly influence the movement of the denture base in patients with poor ridges.
**Option D:** Not directly related to the movement of the denture base. While the type of denture adhesive may affect the denture's retention, it does not directly influence the movement of the denture base in patients with poor ridges.

**Clinical Pearl / High-Yield Fact**
When assessing a patient with a denture, it is essential to evaluate the mucosal support and the distribution of forces to determine the stability of the denture. A well-fitting denture that is supported by adequate mucosa will experience minimal movement.

**Correct Answer:** B.