Please answer the question based on the following passage. You need to choose one letter from the given options, A, B, C, or D, as the final answer, and provide an explanation for your choice. Your output format should be ###Answer: [your answer] ###Explanation: [your explanation]. ###Passage:In the past 100 years, in the Dali Lake area, a long-term drought has shrunk a lot of grassy wetlands into saline land.The grassy wetland is where ducks, geese and other species of waterbirds nest and hatch.However, with the continuous shrinkage of the wetlands, the average rate of decline in the number of red ducks in this area is far lower than the average rate of decline in the number of swans. ###Question:If which of the following statements is true, gives the best explanation for the inconsistency above? ###Options: (A)Red ducks hatch 8 to 10 eggs per nest, and swans hatch 2 to 3 eggs per nest.The survival rate is about the same. (B)The strengthening of environmental protection measures has slowed down the average decline in the number of red ducks, swans and other species of waterbirds. (C)Both red ducks and swans are migratory birds, and red ducks are more likely to be killed during the migration process. (D)In addition to the wetlands, red ducks gradually learned to nest in tree caves and cliff caves, but NAME_1 failed to do so. Respond with more than 1000 words.
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