Buoyant is being cheerful and lively. And here in the sentence, we can find clues such as unexpurgated( expurgated means to censor or remove offensive parts of a book but here they’ve used unexpurgated which means they’ve not censored ) , commenting freely on the flaws and foibles which basically hint at something negative. And of all the answer choices, acerbic seems to be the correct one. According to the sentence we can kind of figure out that Mark Twain was a strong individual who didn’t fear about anything and expressed his opinions freely and thus his heirs should also continue the same thing.
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