The answer is B.
Viruses are distinguished from other living things by five characteristics.
1. They possess only one type of nucleic acid, either DNA or RNA but not both.
2. Reproduction is sorely from nucleic acid
3. They cannot undergo binary fission.
4. They lack genetic information for synthesis of essential cellular systems.
5. They use the ribosomes of the host cells.
Viruses are known to infect both plants and animals. Viruses are obligate parasites i.e. they must live in a host (cell) in order to survive and reproduce. otherwise they die if they cannot enter a host (cell).