One of the characteristics of the Bar-headed geese in flight is that they often fly in a certain formation, usually the birds behind are flying behind the side of the previous bird, so there is a common "herringbone" formation. Some studies The author believes that this formation can reduce the air resistance and reduce the energy consumption of the flight, but the opponents believe that if it is to reduce the resistance, the bird should choose a straight formation, because a flight following a flight can minimize the following The air resistance that the user needs to overcome. Which of the following, if true, would most challenge the opponent's conclusion? ['During the flight, the lead geese will occasionally swap positions with their rear companions, otherwise they will be easily exhausted.', 'Bar-headed geese drifted ahead of their companions. Although they cannot minimize air resistance, they can greatly reduce the energy consumption required for ascent.', 'Bar-headed geese will need a certain direction when flying, so they will not always be arranged in a "herringbone" flight.', 'In speed skating competitions, athletes often advance in a "herringbone" shape. One athlete is ahead, the other three are close behind, and the last three players benefit from the reduced resistance.']