Singular definition. In nouns, pronouns, and verbs, the grammatical form that refers to only one thing. In the following sentence, the singular words are italicized: “The police officer stops anyone who crosses before the light changes.” (from google)
I'd have to go with:
"Africanized honeybees are now known as killer bees for several scary."
How and when Killer bees were created and where, is immaterial. The main point the article is trying to make is about the Dangers of the Killer Bees and why they are so dangerous.
The answer should be number 4
