Fill in the blank with an appropriate preposition :
Owing ________ his ill health, he took early retirement from his job.

Correct option is B

The correct prepositional phrase is "owing to", which means "because of" or "due to".
· Owing to is always followed by a noun or noun phrase and is used to indicate the reason or cause of something.
· Meaning in Hindi: उसकी खराब सेहत के कारण उसने जल्दी सेवा निवृत्ति ले ली।
Example Sentences:
· Owing to heavy rainfall, the match was cancelled.
· The flight was delayed owing to bad weather.
Explanation of Incorrect Options:
(a) in – Incorrect
· Not used with "owing" in standard English
· “Owing in” is not a valid prepositional phrase
(c) of – Incorrect
· “Owing of” is grammatically incorrect
(d) for – Incorrect
· “Owing for” does not convey cause or reason in this context
Conclusion:
The appropriate preposition to complete the phrase "Owing ___ his ill health" is "to", making the sentence grammatically and contextually correct.