Arnav's answer in the first round of the finals should not count. It is Negev Desert, not Negevs Desert as he said.
Also, the question was "Petra is located in which desert". Arnav answered "Negevs" and was told that he was correct, but this is incorrect. Petra is in Jordan. The Negev Desert is in Israel. The Wadi Arabah valley divides the two. Petra is actually not located in a desert, but in Jordan's Eastern Highlands on the edge of the Ard As-Sawwan Desert. I realize that Arnav gave that answer because that is what the study packet he was given told him, but whoever made that packet needs to get their geography straight. Besides the fact that claiming Petra is located in Israel can be taken as a political statement.