<u>Explanation:</u>
According to the author, Anna Quindlen, what is holding the separate parts of America together now is a common enemy; namely <em>Terrorism.</em>
From the text, we could infer that the actual meaning of the quote: "Terrorism has led to devastation--and unity" is referring to the devastating effects the rise in terrorism has had on American lives and the resounding unity that was flared up among fellow Americans in their fight against it.
Chose because decided means a decision and chose also means that you made a decision. I hope that helped!
I am pretty sure the answer is C
