Kingsolver's tone shifts to more factual over page 50 and ahead.
Answer:
the answer is b: to explain how light travels
Explanation:
The answer is the third sentence: "Finally take care to put away all your supplies and clean your workstation, so you are ready for your shift in the morning." because the word 'so' is a conjuction.
You should include opinions that contradict your own, and attempt to say why those opinions are invalid based on your own argument.