A is:

After crude oil, natural gas is the United States' second biggest fuel
source and supplied almost exclusively from reserves in North America.

The problem here is parallelism. It's saying that natural gas is "the United States' second biggest fuel source" -- a noun phrase -- and that it is "supplied almost exclusively from reserves in North America" -- a modifier headed up by a passive participle. Those two phrases aren't parallel.

Moreover, because these two ideas are joined together with "and," it implies that they should be interpreted as parallel in relationship to the phrase that started the whole thing: "after crude oil." In other words, A would make sense only if it made sense to say both "After crude oil, natural gas is the United States' second biggest fuel source" and "After crude oil, natural gas is supplied almost exclusively from reserves in North America." The second one doesn't make any sense. So throwing these two phrases together with 'and' is bizarre in terms of the meaning, in addition to being grammatically wrong.

Moreover, because these two ideas are joined together with "and," it implies that they should be interpreted as parallel in relationship to the phrase that started the whole thing:

Yaa I think thats one of the primary reason to elliminate A !! yaa

Vishu

Yaa I think thats one of the primary reason to elliminate A !!

Yeah, I thought about it some more and I think that's the problem that contributes the most to making it sound terrible. So the takeaway is that if you have a list of phrases joined with 'and', 'but', or 'or', you need to make sure they all make sense in the larger context -- not just the first one on the list.

Thanks it was great