题目选项分析

For the first time in the modern era, non-Hispanic Whites are officially a minority in California, amounting to a little less than half the population of the state, down from nearly three-quarters a decade ago.

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 a decade ago, when it was nearly three-quarters.