【单选题】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 psy chological profiles measurin...
A.
The medical personnel who served in heavy combat had completed significantly less schooling prior to military service than had other medical personnel.
B.
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.
C.
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.
D.
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.
E.
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.