What term best describes twain's exploration of social-class structure in the adventures of huckleberry Finn?

The term that best describes Mark Twain's exploration of social-class structure in "The Adventures of Huckleberry Finn" is social commentary or social criticism. Twain uses the character of Huck to highlight the injustices and hypocrisies within society, particularly in relation to race and class. He challenges conventional attitudes towards social hierarchy and exposes the flaws in the existing social order.