Thanks for the question! So we’re being asked here for the primary reason the author discusses metaphor in the second paragraph. So what’s going on in that 2nd paragraph? The author is describing what corridos are like from a literary perspective, saying that they tell their stories simply and swiftly, without embellishments. No fancy prose or anything like that. And then we’re told about some metaphors to show that even when metaphors are used, they’re using everyday images. And so the discussion of the metaphors helps us understand how direct the language in corridos is, and that’s what (A) says, making it the correct answer.
Hope this helps! Feel free to ask any other questions that you might have.