A 2-year-old child is diagnosed with neuroblastoma. The nurse understands that which of the following tests help to determine the extent of tumor metastasis?

A. A basic metabolic panel is a blood test that measures various substances in the blood, but it is not used to determine the extent of tumor metastasis. B. A lumbar puncture can be used to detect cancer cells in the cerebrospinal fluid, but it does not provide a full picture of metastasis. C. A head CT (computed tomography) scan is a valuable imaging test that can help determine the extent of tumor metastasis, particularly to the brain or skull. D. A biopsy is used to diagnose the type of tumor but is not typically used to determine the extent of metastasis on its own.