Correct Response: B. When physical contact or accidental collisions might occur in competitive sports, participants should be approximately matched according to height, weight, and skill or ability level. This strategy enhances student safety and decreases risk of injury. Coaching students in effective strategies to use during game play is desirable and unlikely to lead to dangerous outcomes (A). Modifying a regulation playing field or its court dimensions is not inherently dangerous (C) and is commonly used for small-sided games and to accommodate students' skill levels. Rotating players among different positions allows students to experience a variety of game like conditions and practice both offensive and defensive skills; this strategy does not create undue risk (D).