Viruses are called that because

The correct answer is: C. Both A and B

Viruses are called that because they are viruses, which means they are non-living particles that can replicate only inside living cells. They can copy themselves and spread from one cell to another, causing disease.

Option A is incorrect because viruses are not actually living things. They do not have cells or any of the other structures that are necessary for life.

Option B is incorrect because viruses cannot replicate on their own. They need to infect a living cell in order to replicate.

Option D is incorrect because viruses are both viruses and they can copy themselves and spread.