gmatprep里得一道逻辑,完全看不懂

今天做了prep有题不懂,大家来帮忙看看

although fullerenes----spherical molecules made entirely of carbon---- were first found in the laboratory, they have since been found in nature, formed in fissures of the rare mineral shungite.Since laboratory synthesis of fullerenes requires distinctive conditions of temperature and pressure, this discovery should give geologists a test case for evaluating hypotheses about the state of the Earth's crust at the time these naturally occurring fullerenes were formed.

which of the following, if true, most seriouly undermines the argument?

a.cofirming that the shungit genuinely contained fullerenes took careful experimentation

b.some fullerenes have also been found on the remains of a small meteorite that collided with a spacecraft.

c.The mineral shungite itself contains large amount of carbon, from which the fullerenes apparently formed

d.The natural occurring fullerenes are arranged in a previously unknown crystalline structure

e.shungite itself is formed only under distinctive conditions.

这题在说什么有谁能说一下大概吗?

Please double check word by word see if you have any typing mistake. I have interest to take a look at this question too.

答案是啥？

我选了C

我觉得B不是很对，不知道我的理解对不对

因为题中说＂they have since been found in nature＂

B中说＂also been found on the remains of a small meteorite ＂，即这两种source是可以被区别的，不会产生误判断

而C是说nature中发现的fullerenes存在于shungit里，shiungit又含carbon，因此在它存在的N年中只要遇到适当的温度和压力就能产生fullerenes（象实验室里一样），那么在同一个shungit里即存在不同时代的fullerenes,无法判定地壳状态

不知道俺这样理解对不对

楼上的,这段纯属你的发散思维,题目和C选项中没有提到也没有暗示,而且也推测不出上面的文字

并且我认为C选项只是把题干内容重复了下,没有起任何削弱和支持的作用

FlowerJay解释的B很清楚

sorry, i've forgotten to give u the key, the choice is D