GWD-TN-19 各位大神解释下啊

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第27题
Most insomnia is not an illness or a physical condition so much as a symptom of another problem that may simply be a reaction to certain medications, anxiety about travel, or stress before a job interview.


A.    an illness or a physical condition so much as a symptom of another problem that may simply  be a reaction to certain medications
B.    an illness or a physical condition so much as symptomatic of another problem that may be a simple one, like a reaction caused by certain medications
C.    so much an illness or a physical condition but a symptom of another problem that may be as simple as when certain medications cause a reaction
D.    so much an illness or a physical condition, but it is a symptom of another problem, maybe a simple one like certain medications causing a reaction
E.    so much an illness or a physical condition but symptomatic of another problem, maybe simply a reaction to certain medications

这道题我选了C，答案是A,解释下啊

白菜白菜

答案是E。C的when certain medications cause a reaction 和后面的句子不平行。