The correct adjective to use in the blank is OPTION 3 - worst.
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The sentence talks about the most extreme situation ("the ________ thing of all"), so we need the superlative degree of the adjective.
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Bad (simple/positive) → (comparative) Worse → (superlative) Worst.
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So, the correct sentence is:
The worst thing of all was that his daughter was rude to him.
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