D. Worst, because bad is turned into worst when comparing three or more things. Just like when it comes to bad jokes, I'm the worst!
D. Worst
The correct superlative form of the adjective "bad" is "worst." To form the superlative form of an adjective, you typically add "-est" to the end of the adjective. In this case, "bad" becomes "worst." So, the answer is D. Worst.
