Read the excerpts from "One Flu over the Cuckoo's Nest."Scientists debated creating a killer virus to study in the lab. In 2005, the Centers for Disease Control proposed deliberately combining a deadly bird flu virus with a very contagious human flu virus to understand whether and how it might cause a worldwide outbreak, or "pandemic." Scientists said the lab experiments would help them understand what might already be happening naturally. The proposed experiment was highly controversial.***But other people thought such research was a terrible idea. What if these viruses escaped the lab by mistake? What if a government or terrorist organization wanted to use the viruses against their enemies?Which phrase creates a fearful tone in the excerpt?the lab experiments would help them understandproposed experiment was highly controversialthe Centers for Disease Control proposed deliberately combininga government or terrorist organization wanted to use the viruses

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