P245 253

antonia

P245 253
Recent evidence appears to contradict earlier findings that suggested that those who are physically fit cope better with stressful real-life events. Of a group of healthy women, those randomly assigned to a ten-week program of aerobic exercises performed no better in laboratory test simulating stressful situations than did the subgroup assigned to a program without exercise.
--Which of the following, if true, provides evidence for determining whether physical fitness makes one react better to stress?
(D) College students with previous high levels of stressful life event showed a markedly reduced
reaction to such events after training in aerobics for six months.
能帮我分析一下这道题吗？conclusion 和evidence各是什么？答案为何是D？