He was one of the worst men in the world (Make Positive).

Explanation: He was one of the worst men in the world- এই sentence টি Superlative degree তে আছে। 
- One of the যুক্ত Superlative degree কে Positive degree তে রূপান্তর করার নিয়ম: 
Very few + superlative degree এর পরের অংশ + verb এর plural form বসে + so বসে + superlative degree এর positive form বসে + as বসে + প্রদত্ত sentence এর subject বসে। 
- তাই সঠিক উত্তরটি হবে: Very few men in the world were so bad as he. 

Source: Advanced Learner's English Grammar & Composition by Chowdhury & Hossain.