Looking at the pattern so far, my opponent has chosen scissors in 3 out of 4 rounds (rounds 1, 3, and 4). This shows a strong preference for scissors. I just won the previous round by choosing rock against scissors, so I'll stick with rock again. While there's a chance my opponent might anticipate this and switch to paper, the historical data suggests they favor scissors, making rock a strategically sound choice to capitalize on their apparent pattern.