**Core Concept**
A malignant tumor of childhood that frequently metastasizes to bones is a type of cancer that originates in the bone marrow or other tissues. This tumor type is characterized by its rapid growth and potential to spread to distant sites, including bones.

**Why the Correct Answer is Right**
The correct answer is a type of cancer that primarily affects children and young adults. It is known to cause lytic bone lesions due to its aggressive nature and bone-marrow infiltration. The tumor cells produce enzymes that break down bone tissue, leading to bone pain, fractures, and pathological fractures. The most common site for metastasis is the bones, particularly the long bones of the extremities.

**Why Each Wrong Option is Incorrect**
**Option A:** Leukemia is a type of cancer that affects the blood and bone marrow but is not primarily known for metastasizing to bones in the same way as the correct answer.

**Option B:** Lymphoma is a cancer of the immune system and can metastasize to various tissues, including bones, but is not typically associated with childhood and bone metastasis as the correct answer.

**Option C:** Neuroblastoma is a type of cancer that arises from immature nerve cells and can metastasize to bones, but it is not the most common type of childhood cancer that metastasizes to bones.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the correct answer is a type of cancer that is highly responsive to chemotherapy and radiation therapy, making early diagnosis and treatment crucial for improved outcomes.

**Correct Answer:** C. Rhabdomyosarcoma