Answer:38. A. 15 (This is a standard point requirement in many volleyball and basketball games to win a set, excluding the final set) 39. A. Center Back (The server typically starts at the back of the court, in the center position.) 40. A. Libero (Libero is known for their defensive role and often wear a different colored jersey.) 41. C. 11mx18m (This is the standard dimension of an official volleyball court.) 42. B. Heart rate (Heart rate is a reliable indicator of exertion and intensity during physical activity.) 43. C. Rally (A rally begins when a player serves the ball over the net and continues until a point is scored.) 44. C. The athlete may be overexerting themselves (A high RPE indicates that the athlete is working too hard and may risk injury.) 45. C. Hitting the ball forcefully downward over the net (This is the definition of a spike in volleyball.) 46. A. Engage in moderate cycling for 45 minutes, 3 times a week. (This aligns with the principle of progressive overload for cardiovascular endurance training.) 47. B. Lack of facilities or equipment (This is a common barrier to participation, especially after school hours when access to school facilities might be limited.) 48. B. To maximize the efficiency of effort throughout the game (Pacing helps athletes manage their energy and avoid fatigue.) 49. B. 8 Seconds (This is the standard time given to the server in volleyball after the referee's whistle.) 50. B. Efficient distribution of effort to sustain performance (Pacing helps athletes maintain a consistent level of effort without overexerting themselves.)