Answer:Some will insist that spending $5 million on animals is foolish. “Spend that money on people,” they will argue. Certainly, it’s a good idea to repair the city’s streets. And remodeling the high school library is important
Explanation:I TOOK THE TEST
I think you're talking about a participal phrase.
Ex:Awakened by the blaring horns,Aaron looked out the window.
<span>For over two hundred years, the reason for New England's Dark Day was unknown.
This represents the main idea because it lets the reader know that the passage is talking about a "Dark Day", where it happened (New England), and the fact that for over two hundred years it was a mystery. It also gives an indication that the mystery will have been solved by the end of the passage. </span>