Physiological research has uncovered disturbing evidence linking a number of structural disorders to jogging. Among the ailments seemingly connected with this now popular sport are spinal disk displacements, stress fractures of the feet and ankles, knee and hip joint deterioration, and tendonitis. Furthermore, these injuries do not occur exclusively among beginning runners, veteran joggers suffer an equal percentage of injuries. What the accumulating data suggest is that the human anatomy is not able to withstand the stresses of jogging.
Which one of the following is an assumption of the argument?
A. The link between jogging and certain structural disorders appears to be a causal one.
B. Jogging causes more serious disorders than other sports
C. The jogger’s level of experience is a factor determining the likelihood of a jogging injury.
D. Some sports are safer for the human body than jogging.
E. The human species is not very durable.
我不明白为什么选A，哪里能看出是casual呢？
哪位NN帮忙解释一下吧，谢谢！
慢跑和某些身体结构异样的关系The link between jogging and certain structural disorders ，是因果关系appears to be a causal one
这是你需要给出的假设以支持文中的结论
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