During the 1980' s Japanese collectors were very active in the market for European art, especially as purchasers of nineteenth-century Impressionist paintings. This striking pattern surely reflects a specific preference on the part of many Japanese collectors for certain aesthetic attributes they found in nineteenth-century Impressionist paintings. Which one of the following, if true, most strongly supports the explanation above? ['Several nineteenth-century Impressionist painters adopted certain techniques and visual effects found in Japanese prints that are highly esteemed in Japan.', 'Impressionist paintings first became popular among art collectors in Europe at the beginning of the twentieth century.', "During the 1980s, the Japanese economy underwent a sustained expansion that was unprecedented in the country's recent history.", 'During the 1960s and 1970s, the prices of nineteenth-century Impressionist paintings often exceeded the prices of paintings by older European masters.']