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【单选题】
近百年来，在达里湖地区，长期的干旱使多草的湿地大量萎缩，变成盐碱地。多草的湿地是鸭类、鹅类以及其他种类水鸟筑巢和孵化的场所。然而，随着湿地的不断萎缩，该地区赤麻鸭数量平均下降的速度却远低于天鹅数量平均下降的速度。如果以下哪项陈述为真，对上文中的不一致给出了最佳的解释？（）
A.
赤麻鸭每窝孵化8至10枚卵，天鹅每窝孵化2至3枚卵，成活率大体相当。
B.
环境保护措施的加强减缓了赤麻鸭、天鹅及其他种类水鸟数量平均下降的速度。
C.
赤麻鸭和天鹅都是迁徙性鸟类，赤麻鸭在迁徙过程中更容易遭到捕杀。
D.
除湿地外，赤麻鸭逐渐学会在树洞和崖洞筑巢孵化，天鹅则未能如此。
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