Offensive strategies are most similar in football and soccer. Both sports involve moving the ball (or puck) down a field or court to score goals, with an emphasis on teamwork, positioning, and creating opportunities to break through the opponent's defense. While the specifics of play differ, the fundamental concepts of offensive movement and scoring strategies have significant similarities.
In contrast, swimming and tennis involve different types of play, and water polo, while having some overlap with soccer in terms of movement, is played in a more confined space with specific rules related to water dynamics. Therefore, the best answer is football and soccer.