Change into comparative degree: 'No other boy in the class is as intelligent as Karim.'

1. ক
   Karim is more intelligent than any other boy in the class.
   
2. খ
   Karim is the most intelligent boy.
   
3. গ
   Karim is more intelligent than most other boys.
   
4. ঘ
   Karim is as intelligent as any other boy.