A large lake is an important wintering place for migratory birds. In recent years, the lake has experienced problems such as the advance of the dry season and the extension of the dry season. The water level in the dry season is too low and the number of fish is reduced, which affects the feeding of wintering birds. Some experts have suggested that A sluice is built at the river channel to control the water level in the dry season, increase the living space of fish in the lake area, and protect migratory birds in winter. Which of the following, if true, would most effectively weaken expert advice? ["The sluice affects the lake's ability to naturally pour the rivers, fish resources cannot be replenished in a timely manner, and natural reproduction will be seriously affected.", 'Studies indicate that no matter during the high or low water period, high water levels will make it difficult for migratory birds to feed and may reduce the number of migratory birds.', 'Falling water levels will open the door to poachers tempted by soaring bird prices.', "The sluice blocked the finless porpoise's migratory route in this lake and river section. Even if the gate is left on the sluice, it is difficult for the finless porpoise to drill through because of the fast water flow."]