请教一道填空
By pointing out the self-serving nature of the governor’s motives for supporting the new health care policy, the columnist implied that the governor’s idealistic-sounding explanation of her position on the issue was almost certainty _____.A. impractical
B. derivative
C. simplistic
D. disingenuous
E. ineffectual
答案是D，请问如何得出，为什么不可以选A和E，谢谢 前面提到了self-serving nature,对于后面的评价disingenuous逻辑上最合理 对应self-serving nature
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