## **Core Concept**
The question tests knowledge of pediatric oncology, specifically the metastatic patterns of common childhood tumors. Bone metastasis is a significant concern in certain childhood cancers, affecting treatment and prognosis. The tumors in question likely include neuroblastoma, Wilms tumor, rhabdomyosarcoma, and hepatoblastoma.

## **Why the Correct Answer is Right**
Neuroblastoma (Option C) is a pediatric cancer that originates from immature nerve tissue, most commonly arising in the adrenal glands. It is well-known for its potential to metastasize widely, including to the bones, bone marrow, lymph nodes, and liver. The tumor's tendency to metastasize to bone is due to its neural crest origin and its ability to secrete various factors that facilitate spread. This characteristic makes neuroblastoma a prime suspect for a tumor that frequently metastasizes to bone.

## **Why Each Wrong Option is Incorrect**
- **Option A:** Wilms tumor, also known as nephroblastoma, primarily affects the kidneys in children. While it can metastasize, its most common sites of spread are the lungs, liver, and regional lymph nodes, rather than bone.
- **Option B:** Rhabdomyosarcoma is a soft tissue sarcoma that can occur in various parts of the body. Although it can metastasize to bones among other places, it is not as commonly associated with bone metastasis as neuroblastoma.
- **Option D:** Hepatoblastoma is a liver cancer that occurs in children. Metastasis can occur, often to the lungs, but bone metastasis is less common compared to neuroblastoma.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that neuroblastoma often presents with systemic symptoms and can have widespread metastasis at diagnosis, including to the bones, which can cause bone pain or pathologic fractures. The presence of bone metastasis significantly impacts the staging and treatment plan.

## **Correct Answer:** C. Neuroblastoma.