How effectively do the authors support the claim that there are potential downsides to
GMOs?

i don't know and i don't care .

answer: inference

explanation:

an inference can be understood as a conclusion to which a person is able to get based on reasoning. it is the same as a deduction, a guess, an assumption.   in the sentence presented, the conjunction "but" gives the readers an idea of contrast, and, therefore, allows them to induce that despite the opponent's characteristics, andrea had something different that made her win.