Pick out the correct word to complete the sentence:
One should do ______ duty sincerely.

Correct option is D

The correct option to fill in the blank is (d) one’s.
Explanation:
The pronoun “one” is a generic subject referring to people in general. When “one” is used as a subject, the possessive pronoun should also be “one’s” for grammatical consistency. Hence, “One should do one’s duty sincerely” is correct.
Explanation (Hindi):
जब वाक्य में “one” का प्रयोग सामान्य व्यक्ति को दर्शाने के लिए किया जाता है, तो उसका स्वामित्व दिखाने वाला सर्वनाम भी “one’s” होना चाहिए। इसलिए सही वाक्य होगा – “One should do one’s duty sincerely.”
Meanings and relevance of other options:
· (a) his – Refers specifically to a male, not general.
Hindi: उसका (पुरुष के लिए)
· (b) her – Refers specifically to a female.
Hindi: उसकी (महिला के लिए)
· (c) their – Plural possessive; not suitable when “one” is used as a singular generic subject.
Hindi: उनका (बहुवचन)