What is the corrected version of the sentence: One should do one’s duty...? Mcqs

What is the corrected version of the sentence: One should do one’s duty...?

(A) One should do their duties.

(B) One should do one's duty.

(C) One should do duties.

(D) One should do one duty.

Source: This question is taken from the Assistant Service and General Administration (S&GAD) Paper