A 2-year-old boy has a solid mass of tumor on the lower pole of his right kidney. Histopathological studies show whorls of mesenchymal cells and clusters of disorganized epithelial cells rather than renal corpuscles and renal tubules, which confirm your suspected diagnosis.

What is true regarding treatment and/or prognosis of this diagnosis?
a. The prognosis is poor, and the only treatment option is palliative care.
b. Surgical removal of the tumor is the most common treatment, with a good prognosis for long-term survival.
c. Chemotherapy and radiation therapy are the primary treatment modalities, with a fair prognosis for long-term survival.
d. The tumor is likely benign and may not require immediate treatment, with a good prognosis for long-term survival.