Choose the most appropriate adjective.
The ________ thing of all was that his daughter was rude to him.

worst

The correct adjective to use in the blank is worst. The word worst is the superlative form of the adjective bad, which means that it indicates the most extreme degree of badness. In this case, the worst thing of all was that his daughter was rude to him, which means that it was the most bad thing that happened.

The other options are incorrect.

• Bad is the general term that can be used to describe something that is not good.
• Worse is the comparative form of the adjective bad, which means that it indicates a higher degree of badness than bad.
• None of the above is not an adjective.