Need some help with these homework questions, thanks!

Question 17 In the Keynesian aggregate expenditures model, "aggregate expenditures" refer to: O the amount of demand for consumer goods that would arise if all citizens had all the income they wanted 0 consumer spending measured in constant prices. 0 the combined expenditures of consumers, businesses, governments, and foreigners (net exports). O the amount of GDP that could be produced if unemployment were zero. Question 18 The horizontal segment of the aggregate supply curve 0 marks the full-employment level of real GDP 0 shows that real GDP can increase without affecting the economy's price level. C) depicts a negative relationship between real GDP and the price level. 0 depicts a positive relationship between real GDP and the price level. C) shows that real GDP can increase only by affecting the economy's price level