GMAT Sentence Correction (SC) | Re: Laos has a land area about the same as Great Britain but

Laos has a land areaabout the same as Great Britain but only four million in population, where many are members of hill tribes ensconced in the virtually inaccessible mountain vallyes 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