The four alternatives suggested, select the one which best expresses the same sentence in Passive/Active voice.
They have done this to defuse the crisis.
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The crisis has been defused by them.
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This has been done by them so that crisis is defused.
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This have been done by them defuse the crisis.
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To defuse the crisis this was done by them.
B.
This has been done by them so that crisis is defused.



