HEEEEEELLLLLLLLLLPPPPPPPPPPP!?

I am in 7th grade and my teacher said to chose a book for a book report. I have no idea what it is on. But she said to chose a book. I have read Percy Jackson and The Lightning Thief and am stuck in between the sequel of that and Animal Farm by George Orwell... WHAT SHOULD I DO AND WHY!?!?!?!?