c) is the emphatic form, often used to challenge a claim to the contrary. There is nothing in the context that requires an emphatic denial of something already said. Both b) and c) are grammatical, but only b) makes sense in the context of the given sentence.
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NugsoHow are we going to do that? I wonder how we're going to do that. According to that "conversion", I thought I had to write every word in its question form. Anyway, thanks again, CalifJim.Ah! I think I see the problem you're having now. I did not understand the exact reason why you chose c).
NugsoI think CalifJim meant to say "B"Yes. I didn't want you to get the wrong idea is all.