Thanks for the question! So we’re trying to find which one of the pairs of documents is most like the relationship between passages A and B. The first passage is about redefining “national minority,” and the second passage is about rules for what constitutes a national minority. Meanwhile, although the first title might fit about revising the definition of welding, the second part just enumerating job duties carried out by welders doesn’t fit passage B. And so the second part of (C) makes it wrong.
Hope this helps! Feel free to ask any other questions that you might have.
