**Core Concept**
The question is inquiring about the prognosis of various pediatric malignancies. The prognosis of cancer in children is often determined by factors such as the type of cancer, stage at diagnosis, and response to treatment. Among pediatric cancers, some have a significantly better prognosis than others due to their favorable biology and response to therapy.

**Why the Correct Answer is Right**
Hodgkin lymphoma (HL) is a type of lymphoma that primarily affects children and young adults. It is characterized by the presence of Reed-Sternberg cells in the lymph nodes. HL has a high cure rate, especially when diagnosed at an early stage, due to its sensitivity to chemotherapy and radiation therapy. The 5-year survival rate for children with HL is approximately 85-90%. The treatment of HL typically involves a combination of chemotherapy, radiation therapy, and in some cases, stem cell transplantation.

**Why Each Wrong Option is Incorrect**
**Option A:** Acute Lymphoblastic Leukemia (ALL) is a type of blood cancer that affects the bone marrow and blood. While ALL is the most common type of cancer in children, its prognosis is generally worse than HL, especially if diagnosed at a late stage. The 5-year survival rate for children with ALL is approximately 80-85%.
**Option B:** Neuroblastoma is a type of cancer that develops in the adrenal glands or sympathetic nervous system. It is a highly aggressive tumor with a variable prognosis, depending on factors such as age at diagnosis, stage, and genetic characteristics. The 5-year survival rate for children with neuroblastoma is approximately 40-50%.
**Option C:** Rhabdomyosarcoma is a type of soft tissue sarcoma that affects the muscles. It is a rare tumor in children, and its prognosis is generally poor, especially if diagnosed at a late stage. The 5-year survival rate for children with rhabdomyosarcoma is approximately 60-70%.
**Option D:** Wilms tumor is a type of kidney cancer that affects children. While it has a relatively good prognosis, especially if diagnosed at an early stage, its prognosis is generally worse than HL. The 5-year survival rate for children with Wilms tumor is approximately 80-90%.

**Clinical Pearl / High-Yield Fact**
It is essential to note that the prognosis of pediatric malignancies is highly dependent on early diagnosis and treatment. Children with HL have a high cure rate due to its sensitivity to chemotherapy and radiation therapy. Early detection and prompt treatment are critical in improving outcomes for children with cancer.

**Correct Answer: C. Hodgkin Lymphoma.**