If you want to get a reader's attention you would might like to use a sentence that has purpose or something that can suprise the reader and interest them to read deeper,
like:the ice melts quickly on the river over the warm dry sun...
Answer:
The whole senctnece because the sentence starts with because.
Oakland is supposed to be the underdog in the game tommorow light, so the team that is supposed to win is the Kansas City Chiefs.