In English, to form the plural of most nouns, we often add -es or -s to the singular noun. In this instance, the singular noun is "virus". The plural form follows the standard rule by adding -es, making it "viruses".
The correct plural form of "virus" is:
The other options presented do not follow standard English pluralization rules for the word "virus". Specifically:
- Virae: Incorrect, as it doesn't follow any established plural form of "virus".
- Virii: Incorrect and based on a misunderstanding of Latin, which does not apply here.
- Virus: Incorrect in this context, as "virus" is singular.