亲亲们，求教GRE中一道关于interstellar material 的阅读题 ~~~

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The dark regions in the starry night sky are not pockets in the universe that are devoid of stars as had long been thought. Rather, they are dark because of interstellar dust that hides the stars behind it. Although its visual effect is so pronounced, dust is only a minor constituent of the material, extremely low in density, that lies between the stars. Dust accounts for about one percent of the total mass of interstellar matter. The rest is hydrogen and helium gas, with small amounts of other elements. The interstellar material, rather like terrestrial clouds, comes in all shapes and sizes. The average density of interstellar material in the vicinity of our Sun is 1,000 to 10,000 times less than the best terrestrial laboratory vacuum. It is only because of the enormous interstellar distances that so little material per unit of volume becomes so significant. Optical astronomy is most directly affected, for although interstellar gas is perfectly transparent, the dust is not.
18. It can be inferred from the passage that the density of interstellar material is
　　(A) higher where distances between the stars are shorter
　　(B) equal to that of interstellar dust
　　(C) unusually low in the vicinity of our Sun
　　(D) independent of the incidence of gaseous components
　　(E) not homogeneous throughout interstellar space

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正确答案是E选项
我在C和E选项中纠结。看题目中的加粗句，C选项“在我们的太阳附近异常地低”也说得通，E选项“在星际中并不是均匀分布的”也可以推测出来。我第一眼就选了C。。。
请问大家这道题为何应该是E呢？难道infer题不能直接用原文中直接出现的信息吗？
谢谢大家！感激不尽！