First of all, I can't help but feel a bit snarky about this. I know this is a
question out of some Chinese exam.
Having seen the actual exam, I am not entirely convinced that even its author knew exactly what the right answer was. Just as an aside: You'd think they'd be a little more circumspect in designing it.
If I were to take it into actual context, from Shaw's life in politics and social theories, the use of revelation is quite deliberate.
Revelation: Something that is made known; something that is revealed
That type of language is exemplified in the bible. For example:
This book is the Revelation of Jesus Christ.
It came as a revelation.
That is, a fact or a truth is made known to a person(s), and in a way that was not obvious or was surprising in some way.
There is divine revelation. The source of which is a deity or a god.
And there's revelation from facts that are discovered and made known.
The discovery of penicillin in 1928 by accident, was a medical revelation. It was a powerful tool that cured infections and advanced the development of modern antibiotics.
I would not use resolution, but I will not say it's wrong. It is, however, ambiguous.
If you consult a thesaurus, some related words for resolution are settlement, proposal, recommendation, verdict, and conclusion.
For revelation: the words are discovery, epiphany, prophecy, publication, and communication.
Again, it's ambiguous.
But, I'm not even convinced that this exam was even designed correctly in the first place, so that's all I can say.