Based on the opponent's history, they've shown a preference for rock (used in 3 out of 7 rounds). They've also just used rock twice recently to counter my scissors. Since they've beaten me with rock in the previous round, they might be confident enough to use it again. Additionally, in even-numbered rounds (2, 4, 6), they've never chosen rock, suggesting they might follow a pattern. Paper would be my best strategic choice to counter an anticipated rock.