Were you a bird, you ___________________ in the sky.
Useful links
https://en.wikipedia.org/wiki/Conditional_sentence
https://www.grammarly.com/blog/conditional-sentences-was-instead-of-were/
In conditional sentences if your conditional sentence (if I ...) is in past perfect then in resultant sentence 'would have' will be used.
If I had extra clothes, I would have donated them.
When conditional sentences are imaginary sentences like if I were a cricketer.....then in resultant sentences we have to use 'would'.
References:
Correct Option: A would fly.
The answer is definitely
A...... would fly
A is the answer. You can see the official GATE key here.
http://gatecse.in/wiki/Previous_Year_GATE_Question_Papers_and_Keys
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