Coose the correct variant of the negative sentence to the statement.
They have been able to prove that they can work in a team and make the right decisions in a critical situation.

They have been able not to prove that they can work in a team and make the right decisions in a critical situation.
They have not been able to prove that they can work in a team and make the right decisions in a critical situation.
They not have been able to prove that they can work in a team and make the right decisions in a critical situation.

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Coose the correct variant of the negative sentence to the statement.They have been able to prove that they can work in a team and make the right decisions in a critical situation.