Either add the passage with the question so we know what you are referring to or do not post questions like these. Not everybody has read what you have. This question is completely useless and unanswerable without the story to go off of.
What are the answer choices???
Answer: It separates items in a long list of expectations without slowing the pace of the paragraph.
Explanation:
D is the correct answer! well really its the last answer!
Answer:
You can add how mirrors are made, when they were first invented and by who invented them.