og12 sc 43 D选项为什么不对

togetherus

Laos has a land   area ()are members of hill tribbes ensconced in the virtually inaccessible mountain valleys of the north .
D选项：  comparable to the size of Great Britain ,but only four million in population ,and many
og解释说AND gives undue emphasis to the claim that many of the people in Laos live in inaccessible places .
我没看明白og在说什么意思，求指导

sisleycheerup

谢谢啦·

togetherus

对，where在这里 指代了population是错的。
谢谢回答，明白了^_^)Y

flyever98

恩，原来是where引导的从句，D改成and引导的主句，重心改变了，不好。
where在这里也是错的吧

togetherus

哦，不好意思，
A : about the same as Great Britain but only four million in

population ,  where many

flyever98

是不是改变句子重心了？A选项呢？