关于逻辑中的概念转化问题！

青蓝玉

今天做gwd发现一道这样的题，我上来直接选的A，且A是正确答案，但是当我看到选项C的时候，我觉得说的也对。后来我的分析是：conclusion关注的是fuel，而不仅仅是gas与oil，C只关注于gas与oil，所以我把C排除掉了。

但是：后来我又想，如果代替oil的只有gas，那仅仅oil和gas不就组成了fuel么？所以我又觉得选项C其实跟主结论还是相关的。。

所以想请教一下大家，到底怎样那个看待选项C而可以把她排除掉。谢谢！

GWD6-Q4:
In the past the country of Siduria has relied heavily on imported oil.  Siduria recently implemented a program to convert heating systems from oil to natural gas.  Siduria already produces more natural gas each year than it burns, and oil production in Sidurian oil fields is increasing at a steady pace.  If these trends in fuel production and usage continue, therefore, Sidurian reliance on foreign sources for fuel should decline soon.
Which of the following is an assumption on which the argument depends?
A.    In Siduria the rate of fuel consumption is rising no more quickly than the rate of fuel production.
B.    Domestic production of natural gas is rising faster than is domestic production of oil in Siduria.
C.    No fuel other than natural gas is expected to be used as a replacement for oil in Siduria.
D.    Buildings cannot be heated by solar energy rather than by oil or natural gas.
E.    All new homes that are being built will have natural-gas-burning heating systems.

白菜白菜

我觉得C明显没什么关系啊。。。你这样想，C说除了天然气，没有其他的可以代替oil了。这只能说明天然气很重要，但不能支持结论说S对外国的依靠下降，与题目无关。。并不是题目的一个假设~

青蓝玉

嗯，谢谢了，看你说了之后感觉思路更清晰了