1. The problem asks us to evaluate the reasoning of Grace and Aiden based on the information that koalas are endangered due to forest fires and deforestation. 2. Grace states: "If the forest continues to disappear at its present pace, the koala will approach extinction." This is a logical conclusion because loss of habitat directly threatens koalas' survival. 3. Aiden states: "So all that is needed to save the koala is to stop deforestation." This is an oversimplification because while stopping deforestation helps, it does not address forest fires or other threats. 4. Therefore, Grace's reasoning is correct as it acknowledges the threat, but Aiden's reasoning is incomplete. Final answer: B. Grace only.