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I believe nathan is asking "the best" because he/she doesn't know which of C/C++ is best.
And then, the answer to that might be... depends. Depends on what you want to do.
Writing for embedded...

Wait, isn't this about C and not C++?
That is what the OP stated - wanting to learn C, and it's also what the original links were pointing to - C Resources.
Yet this is in the C++ programming...

You don't have a library to borrow books from? Sometimes you can find some good books there.
And check the books thread for ideas. Perhaps one or two of them might suit you.