B seems to be the best option. Although D is also an interesting choice, I would go with B. "are a hazard for hatchlings" This does clarify the relationship between the claim that lights are hazardous for baby sea turtles and the reason that lights prevent them from coming ashore.
I hope this helps! :)
You ask yourself, "what is the main idea?" "what is the story about?". The theme is like the things that the story surrounds.
Answer:
If this is multiple choice then i think the last one is the answer
Explanation: