So, I've noticed that a lot of the "expert verified" answers are incorrect, and yet, they can't be reported, so you can't get them removed so that the right answers can be added, this is really annoying

Real gross domestic product: a) will increase if the price level increases. b) can change from one year to the next even if there is no change in output. c) will increase if the level of output increases. d) is a measure of inflation.