gwd 逻辑中的一题求解

In general, jobs are harder to get in times of economic recession because many businesses cut back operations.  However, any future recessions in Vargonia will probably not reduce the availability of teaching jobs at government-funded schools.  This is because Vargonia has just introduced a legal requirement that education in government-funded schools be available, free of charge, to all Vargonian children regardless of the state of the economy, and that current student-teacher ratios not be exceeded.

Which of the following, if true, most strengthens the argument?

1. The current student-teacher ratio at Vargonia’s government-funded schools is higher than it was during the most recent period of economic recession.
2. During recent periods when the Vargonian economy has been strong, almost 25 percent of Vargonian children have attended privately funded schools, many of which charge substantial fees.

3. Nearly 20 percent more teachers are currently employed in Vargonia’s government-funded schools than had been employed in those schools in the period before the last economic recession.
4. Teachers in Vargonia’s government-funded schools are well paid relative to teachers in most privately funded schools in Vargonia, many of which rely heavily on part-time teachers.
5. During the last economic recession in Vargonia, the government permanently closed a number of the schools that it had funded.

答案是B，但怎么感觉没什么关系啊？请问牛牛啊～

此题说法律规定的免费公利教育在任何时候都开放与V城的孩子。而且目前公利学校的师生比例的限度没有被超过。B选项说在最近当V城的经济很强的时候，大约25%的V城孩子去了私利学校。私利学校是付费的。由此可以推出如果V城出现经济危机时，大约有25%的孩子可能转向公利学校。那样的话公利学校的老师就不够了。

不知道说清楚了么有

B选项说在最近当V城的经济很强的时候，大约25%的V城孩子去了私利学校。私利学校是付费的。由此可以推出如果V城出现经济危机时，大约有25%的孩子可能转向公利学校。

这样的反推可以吗？V城出现经济危机时，一定会转向公立？

选最优,选最优...

经济衰退收入减少,人们倾向于花钱少.这常识跟 价格上涨销量降低 是一样的.

gmat里面是有涉及到经济学常识