For means "in support of" or "on behalf of". In this case, Ravi died while serving in the Indian Air Force, which means he died while supporting his country.

Indian Airforce soldier Ravi died . . . . . . . . his country. A. for B. to C. on D. in

for

Answer is Right!

Answer is Wrong!

The correct answer is for.

For means “in support of” or “on behalf of”. In this case, Ravi died while serving
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in the Indian Air Force, which means he died while supporting his country.
To means “in the direction of” or “towards”. In this case, it would not make sense to say that Ravi died “to his country”.
On means “on the surface of” or “at a particular location”. In this case, it would not make sense to say that Ravi died “on his country”.
In means “inside of” or “within”. In this case, it would not make sense to say that Ravi died “in his country”.

Therefore, the correct answer is for.