in 1500 aztec indians' empire covered a distance that extended from the atlantic to the pacific and held up to 20,000,000 people,
<the world's densest populated / one of the world's densest populations>
20,000,000 people 이랑 동격을 의미하는 명사구 문제인데 그렇다면 which is 가 생략된 구조잖아요?
그럼 which is the world's densest populated.
which is one of the world's densest populations. 둘다 의미상으론 자연스러운거같은데.....왜 전자는 오답인거죠 ㅠ