A patient with multiple myeloma asks the nurse why this disease developed. Which statement is the best response by the nurse regarding the cause for multiple myeloma?
A. The cause and risk factors for multiple myeloma are unknown and under debate.
B. Hypercalcemia leads to bone degeneration and multiple myeloma.
C. The etiology is unknown, but risk factors include skeletal fractures, family history, and chemical exposure.
D. There is no primary cause for multiple myeloma, but some risk factors, such as radiation and obesity, are associated with the disease.