Corruption is one of the worst problems in our country. (make it comparative)

Superlative: Corruption is one of the worst problems in our country.
Comparative: Corruption is worse than most other problems in our country.

• One of the যুক্ত Superlative Degree কে Comparative Degree তে রূপান্তরের নিয়ম:
- প্রদত্ত Sentence এর sub এবং verb বসে।
- One of the উঠে যায়।
- Superlative Degree এর Comparative form বসে।
- than most other বসে।
- প্রদত্ত sentence এর বাকী অংশ বসে।

• Other options:
ক) Corruption is worser than most other problems in our country.
- এটি ভুল কারন, 'worser' বলে কোনো শব্দ নেই। 'Bad'-এর Comparative form হলো worse.

খ) No other problem is as worse as corruption.
- এটি Positive Degree-র গঠন, Comparative নয়। তাই এটি ভুল।

ঘ) Corruption is worser than any other problem in our country.
- এটি ভুল কারন, 'worser' বলে কোনো শব্দ নেই। 'Bad'-এর Comparative form হলো worse.

Source:
1. Advanced Learner's Communicative English Grammar & Composition By Chowdhury & Hossain.
2. Website English Wizard by Saleh Ahmed.