In the long run, changes in the price level do not affect the level of real gdp. b. in the long run, increases in the price level result in a decrease in real gdp. c. in the long run, increases in the price level result in an increase in real gdp. d. in the long run, changes in the price level may either increase or decrease real gdp.

The last one (D.) is correct

Explanation: Because it says changes in price so the change can increase or decrease it cannot be the first on because the price DOES affect in the long run. It's not the third one because it makes no sense so ya. I hope this was helpful i'm not an expert

answer; the correct answer should be (demonstrations); good luck

answer; ///i believe the correct answer is(e) complementary to each other;