**Core Concept**
Rheumatoid Arthritis (RA) is a chronic autoimmune disorder characterized by inflammation and degeneration of joints, primarily affecting the hands, feet, wrists, elbows, knees, and ankles. It results from an interplay between genetic predisposition, environmental triggers, and immune system dysregulation.

**Why the Correct Answer is Right**
The correct answer is not explicitly given, but we can deduce the correct answer by understanding the typical joints involved in Rheumatoid Arthritis. RA primarily affects the synovial joints, especially those with a high degree of mobility, such as the metacarpophalangeal (MCP) and proximal interphalangeal (PIP) joints in the hands, and the metatarsophalangeal (MTP) joints in the feet. The joints not typically involved in RA are those with less mobility, such as the sacroiliac joints, which are more commonly associated with other conditions like ankylosing spondylitis.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the joints listed are commonly involved in Rheumatoid Arthritis, such as the wrists, elbows, knees, and ankles.
* **Option B:** This option is incorrect because the joints listed, such as the sacroiliac joints, are more commonly associated with other conditions like ankylosing spondylitis.
* **Option C:** This option is incorrect because the joints listed, such as the MCP and PIP joints, are typically involved in Rheumatoid Arthritis.
* **Option D:** This option is incorrect because the joints listed, such as the MTP joints, are commonly affected in Rheumatoid Arthritis.

**Clinical Pearl / High-Yield Fact**
A key clinical feature of Rheumatoid Arthritis is the presence of symmetrical joint involvement, meaning that if one joint is affected, the corresponding joint on the other side of the body is also involved.

**Correct Answer:** B