Nguyên nhân chủ yếu gây ngập lụt ở Đồng bằng sông Cửu Long là do
Đáp án đúng là: C. mưa lớn kết hợp với triều cường.
Giải thích:
Đồng bằng sông Cửu Long có địa hình thấp, lại chịu ảnh hưởng của mưa lớn và triều cường nên thường xuyên xảy ra ngập lụt.
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