Which of the following sentence is correct?

A I think him to be my best friend.

B I think him as my best friend.

C I think of him as my best friend.

D I think him is my best friend.

Correct Answer: Option C

I think of him as my best friend. কারণ, 'বিবেচনা করা' অর্থে think এর পরে preposition হিসেবে of বসে ।