OG12 43

fanlynx

43.Laos has a land area about the same as Great Britain but only four million in population, where many are members of hill tribes ensconced in the virtually inaccessible mountain valleys of the north.
(A)about the same as Great Britain but only four million in population, where many
(B)of about the same size as Great Britain is, but in Laos there is a population of only four million, and many
(C)that is about the same size as Great Britain's land area, but in Laos with a population of only four million people, many of them(D)comparable to the size of Great Britain, but only four million in population, and many
(E)comparable to that of Great Britain but a population of only four million people, many of whom
答案是E

LZ不明白的地方为D选项，OG的解释是说用and改为并列关系是句子中心改变，我明白这样肯定D可以判错，想问的是忽略这一点单独看句子，这个结构在语法上是正确的吗？

因为but...and...没有见过，所以不确定
谢谢！