The answer is D because it tells when the students began whispering and giggling...
It is kind of like the opposite of your claim, kind of like a counterclaim. Maybe what someone would argue with you claim with. If I said "Cookies are the best dessert because they are sweet", that would be the claim. The rebuttal would be "No it is not, cake is the best because it has frosting".
Ummmmm... you didn't attach anything, there's nothing to answer
The best answer here is A: <span>For the first time in decades, Baby Boomers have been outnumbered by another group--the Millennials. An important thing to keep in mind when you are discussing hooks is that they always come at the beginning of a paper or paragraph. They are called hooks because they are meant to hook the reader. If you present them elsewhere, then they don't really serve their purpose. Knowing this, it is easy to use process of elimination to determine that the answer with the first sentence in it is correct.</span>