Select the most appropriate option to improve the bold part of the sentence.
She succeeded by virtue of her talent.

Correct option is D

The correct substitution of the highlighted words is (d) due to.
Explanation: By virtue of (के कारण/की बदौलत) is already correct and formal. Among the choices, due to (के कारण) is the closest standard prepositional equivalent that keeps the formal tone and collocates naturally with “succeeded.” “Because” is a conjunction and would require a clause (e.g., because she was talented), while owing of and cause of are incorrect formations here.
Grammatical rule used: Prepositional phrases ( due to, by virtue of, owing to) must be followed by a noun phrase; conjunction because must be followed by a finite clause.
Example: His victory was due to careful preparation.
Information booster: In very formal writing, prefer owing to / due to + noun; avoid mixing with clause directly ( due to she worked hard ✗).