The correct answer is D. As the wealth of Americans increased the rate of personal savings decreased.
Step-by-step explanation:
The graph presented shows how the personal saving rate and the disposable income changed in America from 1970 to 2002. In the case of the disposable income (red line), which refers to the amount of money citizens have after paying taxes, it can be concluded this increased over time as in 1970 this rate was $3500 and it increased to almost $9000.
On the other hand, the personal savings rate, which refers to the money people can save after spending money on their needs, it can be concluded this rate decreased going from $8000 to $2000. According to this, it can be concluded the disposable income rate, which is related to general wealth increased while the saving rate decreased (option D).