The opponent has shown a clear preference for rock (3 out of 5 rounds), including in the most recent round. While they might try to counter my previous rock move by choosing paper, their historical pattern suggests they're likely to choose rock again. Paper would be the optimal choice against an opponent who favors rock. I'm currently leading 3-0, so I can afford to make a strategic choice based on the opponent's demonstrated tendencies rather than playing too defensively.