I am not from USA and from where I am plagiarism in PowerPoints does not exist. I am recently living in USA, do I have to use quotations when I am making a presentation on PowerPoint or how do you guys do it here??

Yes. If you look up MLA citations, they will give you a good idea of what you need to do. It's good that you're asking!

Explanation:

what is the passage

answer; /// the correct answer to the above statement is (a) because of the decline on native american labor forces;