I cannot for the life of me understand how to arrive at the answer to this question. I mapped the biologist's reasoning as Deforestation>/Koalas, and I mapped the politician's as K>/Deforestation. So in order for the politician to be right, we must meet the sufficient condition; the only way we can know the politician is wrong is if we either have K>Deforestation or (the contrapositive being wrong) Deforestation>K. I didn't see either of these options, and indeed, the correct answer choice says /Deforestation>/Koalas, which IS the correct contrapositive (so it agrees with the politician).
Thank you!
Admin note: Edited the title. Please use the format "PT#.S#.Q# - brief description of question"
Thank you. Really appreciate it.