What does this picture illustrate? A) It shows how aggregate input goes through periods of increase over time to create peaks and troughs. B) It shows how aggregate output increases and decreases based on unemployment and inflation over time. C) It shows how aggregate input goes through periods of highs and lows to promote a globalized upward trading trend. D) It shows how aggregate output goes through periods of recession and expansion in the short-run, but a long-run trend in economic growth.