Pick the grammatically correct option: One should do his duty. - IQ786

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Pick the grammatically correct option: One should do his duty.

Pick the grammatically correct option: One should do his duty.

One should do his/her duty.

One should do their duty.

One should do one’s duty.

One should do his duty properly.

Explanation

The pronoun "one" must be consistent throughout the sentence.

"One's" is the possessive form matching "one."