When demand for a factory's product is high, more money is spent at the factory for safety precaution and machinery maintenance than demand is low. Thus the average number of on-the-job accidents per employee each month should be lower during periods when demand is high than when demand is low and less money is available for safety precautions and machinery maintenance.
which of the following, if true about a factory when demand for its products is high, casts the most serious doubt on the conclusion draw above?
A Its employees ask for higher wages than they do at other times
B Its management hires new workers but lacks time to train them properly
C Its employees are less likely to lose their jobs than they are at other times
D Its management sponsors a monthly safety award for each division in the factory
E its old machinery is replaced iwth modern, automated models
问题是由When demand for a factory's product is high, more money is spent at the factory for safety precaution and machinery maintenance than demand is low.怎么得出less money is available for safety precautions and machinery maintenance。
还有就是B选项是如何起到cast the most serioud doubt 作用的，也是不解啊！希望大侠们指点一下迷津！ | 
