One should do his duty.
Correct answer: B. One should do one's duty.
- A. (A) One should do one duty.
- B. One should do one's duty.
- C. (C) One should does one's duty.
- D. (D) One should do their duty.
Explanation
"One should do one's duty" is a grammatically correct and more formal way to express the idea. It uses the possessive pronoun "one's" to refer back to the indefinite pronoun "one," indicating that each person should fulfill their own duty.
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About Pronoun-Antecedent Agreement
Pronouns must agree with their antecedents in number, person and, where relevant, gender. Questions cover singular and plural nouns, indefinite pronouns, compound antecedents, collective nouns and singular they, along with unclear references and shifts between first, second and third person.
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