问题如下：
From long term view, which of the following would cause the country’s amount of income spent on consumer discretionary goods to increase?
选项：
A. The country’s average level of educational accomplishment is not change.
B. The country’s average level of educational accomplishment increases.
C. The country’s average level of educational accomplishment decreases.
解释：
B is correct.
If the country’s average level of educational accomplishment increases, the workers can perform better skilled tasks and earn higher wages. As a result, they will have more remaining income for discretionary expenditures.
这题能解释一下吗？谢谢