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As for your specific question, the politician states that, "so all that is needed to save the koala is to stop deforestation."
This would be diagrammed as follows:
not D ==> not KAE KAE ==> D
According to the politician's statement, we do not know what happens when deforestation is slowed, i.e. not stopped or D.
We only know what happens when deforestation is stopped, i.e. not D ==> not KAE (the koala will not approach extinction).
As such, we can eliminate (D) and (E) because they could be true, i.e. according to the politician's statement, we do not know what happens when deforestation is not stopped.
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