In 1960, the Highest-Income 20 Percent of the World's Population

In 1960, the highest-income 20 percent of the world's population received $30 for each dollar received by the lowest-income 20 percent of the world's population. By 2000, the disparity had __________.

A) increased to $45 for each dollar
B) decreased to $25 for each dollar
C) increased to $74 for each dollar
D) remained stable at $30 for each dollar