How is refutation effective in forwarding your position in a debate? it makes the audience think the opposition is foolish. it proves your point without having to research evidence. it makes your evidence look better than the opposition's by contrast. it attacks the opposition's evidence, so they cannot prove their point.

D. It attacks the opposition's evidence so they cannot prove their point.

If you point out one of your opponent's facts and then show how it is wrong you are strengthening the proof of your own point. You are showing that you have done the research into your opponent's side but understand how your point is still stronger. 

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