Because standardize tests are for learning the same thing everyone should know.
Hope this helps!
-Izzy <3
The right answer to the question is B.
The only error I can see in this sentence is roll-a-coaster. I believe it should be a roller coaster instead, which is a ride in amusement parks. Other than that, it is more grammatically correct to say "I've just gotten off the wooden" rather than "I just got off the wooden" however, it's up to you.
I would say that you would only use them when you are writing in the thousands or more other than that u don't use them
