Thanks for the question! So we’re looking for the meaning of the words “fully explicit” in lines 24-25, which are referring to the rules for getting from one stage to another of constructing the Koch curve. Now, “expressed unambiguously” just means expressed clearly, and in that sense is weaker. But that’s why it’s the right answer here. (B) says “uncomplicated.” Is that what lines 24-25 are saying? That the rules for getting from one stage to another are uncomplicated and always the same? Sometimes, replacing the words directly can help you get a better feel between two answer choices. And the answer here is no, it’s not necessarily “uncomplicated” (which means simple). It can be complicated, but expressed clearly/unambiguously, and that’s clearly the meaning that the passage is shooting for here. No one is saying that making the Koch curve is easy or simple each step, but there is a clearly expressed way of doing it. And that’s why (C) is a better answer than (B) here.
Hope this helps! Feel free to ask any other questions that you might have.
