We can identify verbal irony (the second option) in the quote from "Uncle Tom's Cabin" where the character talks of a free country while simultaneously professing ownership of a human being.
Verbal irony happens when we use words to express one thing but we actually mean the opposite. The character from "Uncle Tom's Cabin" contradicts his own words when he talks of a free country and immediately says he owns someone else.
In a free country, people cannot own other people. Everyone is equally free. Therefore, there is irony in the character's words, which means they are an example of verbal irony.
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