Which ‘but’ is a preposition?

A It is but right to admit our faults.

B What can we do but sit and wait?

C We tried hard, But did not succeed.

D There is no one but likes him.

Correct Answer: Option B

এখানে but শব্দটি ছাড়া বা ব্যতীত অর্থে preposition হিসেবে ব্যবহৃত হয়েছে।