Fill in the blank with the correct preposition.
Owing ________ his illness, the CEO could not attend the company meeting.

Correct option is C

Correct option: (c) to
Meaning (in detail):
• owing to → because of; due to (Hindi: के कारण / की वजह से)
Example: Owing to fog, the flight was delayed.
Grammatical rule (English):
• Fixed collocation: owing to + noun/pronoun
व्याकरणिक नियम (Hindi):
• “owing to” एक fixed phrase है; इसके साथ to ही आता है।
Meanings of other options (why incorrect):
• (a) for → “owing for” गलत usage है।
• (b) of → “owing of” भी गलत collocation है।
Hence, option (c) is the correct answer.