求解答，绕进去了，出不来了~~谢谢NN们，prep cr1 122

hu0915

122. (30466-!-item-!-188;#058&005453)     (GWD30-Q27)

Personnel officer:  The exorbitant cost of our health-insurance benefitsreflects the high dollar amount of medical expenses incurred by ouremployees.  Employees who are out ofshape, as a group, have higher doctor bills and longer hospital stays than dotheir colleagues who are fit.  Therefore,since we must reduce our health-insurance costs, we should offer a rigorousfitness program of jogging and weight lifting to all employees, and requireemployees who are out of shape to participate.
The conclusion reached by thepersonnel officer depends on which of the following assumptions?
A. A person who is fit wouldreceive a routine physical checkup by a doctor less regularly than would aperson who is out of shape.
B. The medical expenses incurred byemployees who are required to participate in the fitness program would be lessthan those incurred by employees who are not required to participate.
C. The strenuous activitiesrequired of out-of-shape employees by the program would not by themselvesgenerate medical expenses greater than any reduction achieved by the program.
D. The fitness program would servemore employees who are out of shape than it would employees who are fit.
E. The employees who participate inthe fitness program would be away from work because of illness less than wouldthe employees who do not participate.
答案选C
看了很多帖子，我还是对B选项有疑问，参加的比不参加的花费少，原来都不参加的，现在有一部分参加了，总花费不就减少了吗？
取反的话，就是参加的比不参加的花费多，正好也削弱了嘛，就是原来都不参加的，现在有一部分参加了，反而总花费会增加，不会减少。
我的问题到底出在哪里？
求指导，谢谢~~

hu0915