Hi Richa, there are three ways to ask a question in French. Here they all are using your sentence as an example:
1) Qui est-ce que vous avez envie de revoir ? -- using "est-ce que"
2) Vous avez envie de revoir qui ? -- using intonation
3) Qui avez-vous envie de revoir ? -- using inversion
You see that if you want to use "qui" without "est-ce que", you need to use the inverted form (the third one) to ask your question, which is different from what the test expects you to answer.
Hence only the first form can be correct.
-- Chris (not a native speaker).
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