Looking at the pattern, my opponent has chosen scissors in 4 out of 8 rounds (50% of the time), including 3 of the last 4 rounds. This tendency toward scissors makes rock a strong strategic choice. Additionally, rock has been my most successful move, winning all 3 times I've played it. With a current lead of 3-1, winning this round would secure my overall victory regardless of the final round's outcome. While there's a chance my opponent might anticipate this and switch to paper, their demonstrated preference for scissors makes rock the highest probability play.