My first guess would be that it is an independent clause. This is just a single statement.
The answer is A. .For the first time in decades,Baby Boomers have been outnumbered by another group-the millennial.
In a sentence, a hook is the first one or two sentence that is used to grab the reader's attention toward he writing right from the batch.
The hook also introduced the main topic that wanted to be discussed within the writing itself.
Answer:
Joe and Harris were talking <em>about</em> their football match.
First of all/ Which Shiloh book are you talking about?
