You have to pick one of those and leave out the rest? Sheesh.
Unless you are really a serious nature lover, The Yearling is a bit boring and sentimental. I’m a Floridian and a nature lover, and I enjoyed it when I read it in sixth grade, but it’s the first one I’d drop from the list.
Lord of the Flies – A true classic, you need to read it at some point in your life. Story of how a bunch of children stranded on an island naturally develop a very unpleasant society. Is it really the story of children being jerks, or does it say something about adult societies? Pretty high on the list.
A Tale of Two Cities – I’m a huge Dickens fan, and so this would be my top choice, but probably not yours. It takes some work to wade through, maybe read it later in life. The story of how the French Revolution affects some ordinary people. Injustice, poverty, all the stuff Dickens is known for.
A Separate Peace – Don’t know this one.
Animal Farm – Probably the best choice. It’s short, has relatively modern language, and definitely grabs and holds your attention. While it is basically about post communist revolution Russia, the story has a lot to say about any cult of personality as well as the way revolutionary governments in general often work. You should be able to find modern parallels to the events. Go with this one if you have no good reason to pick one of the others.