Help with the sentence structure.

[mylegend2014]

But no nation can survive unless many of its citizens attribute such rights and responsibilities to it, for nothing else could prompt people to make the sacrifices national citizenship demands.

Which is the subject for "Prompt" and what's the meaning of second part of this sentence?

Thank you very much!

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Hi mylegend2014,

When looking at an SC, it's important to include the answer choices for reference. The 5 choices will give you a sense for what rules you should be focused on (which words stay the same and which words change in the answers). Here, since the ENTIRE sentence in underlined, ANYTHING can be changed; beyond the individual words, the meaning/intent of the sentence could very well change too.

Based on what I see here, I'd guess that modification is the primary grammar rule behind this SC, but I'd know for sure if you include the 5 answers.

GMAT assassins aren't born, they're made,
Rich

[mylegend2014]

Hi Rich,
Thank you very much for your quick reply.
Actually this is the sentence from Critical Reasoning question. I don't understand the meaning of this sentence, and usage of "for noting else....demands". I was thinking here should be a good place to ask this kind of question. Sorry for the confusion.
Thanks,

[[email protected]]

Hi mylegend2014,

I see now. To properly understand this sentence, we really need to see the entire prompt (and the question underneath it). This one sentence doesn't give us context for the entire argument that the prompt is trying to make.

GMAT assassins aren't born, they're made,
Rich