Step 1: The question compares the cure (survival) rates of three childhood tumors. Cure rate is best judged by the 5-year survival figures with modern multimodal therapy.
Step 2: Retinoblastoma has the highest 5-year survival, around 97%, because it is usually diagnosed early and responds very well to treatment. This makes option (b) correct.
Step 3: Wilms tumor (nephroblastoma) has an excellent but slightly lower 5-year survival of roughly 88%, so it ranks below retinoblastoma. Option (a) is therefore not the best answer.
Step 4: Rhabdomyosarcoma has the lowest survival of the three, around 61%, because it can be aggressive and is often detected later. So option (c) is wrong, and since the rates differ, option (d) All is also wrong. Retinoblastoma has the highest cure rate.