Yes, I think it is a good thing to go out and expose yourself to new things in life. Because you got to explore the world, about learning things on your own without your parents! Plus, it will totally change your life in life if you expose yourself, new things in the world.
I would say D. because all of the others are basically answering the entirety of the speech. If you would discuss ways to increase the literacy rates in the U.S. you would need to go over it last after you explain why the U.S. is so illiterate.
