| For the first time in the modern era, non-Hispanic Whites are officially a minority in California, which amounts to a little less than half the population of the state, down from nearly there-quarters only a decade ago. A. which amounts to a little less than half the population of the state, down from nearly three-quarters only a decade ago B. which amounts to a little less than half the population of the state, down from a decade ago, when it was nearly three-quarters C. and that amounts to a little less than half the population of the state, down from a decade ago, when they were nearly three-quarters D. amounting to a little less than half the population of the state, down from nearly three-quarters a decade ago E. amounting to a little less than half the population of the state, down from what it was a decade ago by nearly three-quarters
答案是D. down from nearly three-quarters (the population of the state)，省略了后面括号里的内容。
我的问题是 three-quarters 应该是形容词吧？quarters需要用复数形式吗？ | 
