Looking at the opponent's history, they've chosen paper most frequently (4 times out of 9 rounds), including in the most recent round. They've won the last 4 rounds, showing they've adapted to my strategy. Given that they won with paper in round 9, there's a reasonable chance they'll stick with paper again since it worked for them. If they do choose paper, scissors would give me the win. There's a risk they might anticipate this and choose rock, but based on their preference for paper throughout the game (especially in rounds 1, 4, 6, and 9), I believe scissors offers the best chance for victory in this decisive final round.