The second sentence uses parallel structure because there are commas in appropriate places and when this sentence is read aloud is makes sense.
Answer:
I do believe that roller coasters are safe. Roller coasters tend to be much safer than even a simple car ride. There are much more car accidents, more than roller coaster accidents as well. Therefore, I am convinced that roller coasters are safe.
Explanation: The most dangerous ride you'll take during your day at a theme park is the the car ride to and from the park. In 2015, the National Highway Traffic Safety Administration reported 37,133 fatalities on America's roadways.
Answer: D or the third one
Explanation: I believe it is D because it gives strong details. It gives us details about the boulders.
The theme is the message you get from the story. Central idea is just another word for main idea which would be the point or key topic of the story. Hope I I helped and didn't confuse you
