Negative-Sense, Single-Stranded RNA Viruses Are Thought to Have Arisen Many

Multiple Choice

Negative-sense, single-stranded RNA viruses are thought to have arisen many times independently, because

A) nucleotide sequences show that the single-stranded RNA viruses are not closely related.
B) they have diverse capsid morphology.
C) they cause many human diseases, including measles, mumps, and rabies.
D) they have only a few genes.
E) there are no known fossils of them.