A)All types of cancer are associated with a transforming retrovirus. B)Breast cancer patients whose tumors express elevated levels of ErbB2 usually have a longer median survival after diagnosis than those with normal levels of this protein. C)Retrovirus-associated oncogenes are often related to the oncogenes found in increased copy numbers in non-virally induced tumor cells. D)Patients with bladder cancer often have reduced levels of H-Ras expression. E)None of the above.