Medical personnel who served in heavy combat in a recent war-even those who escaped physical injury-now have lower incomes and higher divorce rates, and score lower on psychological profiles measuring general happiness, than medical personnel who served in less stressful settings during that war. This evidence demonstrates that exposure to heavy-combat situations produces serious adverse effects, even among those who suffered no physical harm.
Which of the following, if true, most strengthens the conclusion drawn above?
The medical personnel who served in heavy combat had completed significantly less schooling prior to military service than had other medical personnel. The medical personnel who served in heavy combat tended to be younger at the time of their entry into military service than were other medical personnel. Parents of medical personnel who served in heavy combat show no significant difference in incomes,divorce rates,or general happiness from parents of other medical personnel. Income levels, divorce rates, and levels of general happiness are the same for the medical personnel who served in heavy combat as they are for construction workers. Medical personnel who served in heavy combat in an earlier war show no significant difference in incomes, divorce rates, or general happiness from other medical personnel who served in that war.
c. 服务于重大战役的医疗人员的父母与其他医疗人员的父母在收入、离婚率和快乐方面是 没有显著区别的 （利用了assumption的形式，遗传不起作用，最好地支持确实是环境起了作用）
e. 在上一次战争中，服务于重大战役的医疗人员与其他医疗人员没有显著不同 （上一次没有这样的情况，可以作为反对，注意答案不需要充分性）
No one can be licensed as an electrician in Parker County without first completing a certain course in electrical safety procedures. All students majoring in computer technology at Parker County Technical College must complete that course before graduating. Therefore, any of the college’s graduates in computer technology can be licensed as an electrician in Parker County.
