Which of the following statements regarding viruses is FALSE?

A) Most are too small to be seen by a light microscope.
B) They are "filterable agents" that can pass through porcelain filters that have a pore size that blocks microbes.
C) Their genomes could be composed of DNA or RNA.
D) They are smaller than plasmids and prions.
E) Viral particles, when pure enough, can be crystallized.