Which of the following is the best thesis statement?

Through its contrasting river and shore scenes, Twain's Huckleberry Finn suggests that to find the true expression of American democratic ideals, one must leave "civilized" society and go back to nature.

Mark Twain's Huckleberry Finn is a great American novel.

In Huckleberry Finn, Mark Twain develops a contrast between life on the river and life on the shore.

Huckleberry Finn is a novel about a boy who lives on the river.