Looking at the previous rounds, my opponent has chosen scissors in 4 out of 8 rounds, including the last two rounds (7 and 8). Since rock beats scissors, this seems like a strong statistical play. Additionally, my opponent has only chosen paper once (round 6), making it a less likely threat. Given that I'm ahead 3-2, choosing rock gives me good odds to either win the round or at worst tie if they also choose rock, helping secure my overall lead in the game.