Question ID:PT7 S4 Q8 Passage:George: Some scientists say that global warming will occur because people are releasing large amounts of carbon dioxide into the atmosphere by burning trees and fossil fuels. We can see, though, that the predicted warming is occurring already. In the middle of last winter, we had a month of springlike weather in our area, and this fall, because of unusually mild temperatures, the leaves on our town’s trees were three weeks late in turning color. Stem:Which one of the following would it be most relevant to investigate in evaluating the conclusion of George’s argument? Correct Answer Choice:EChoice A:whether carbon dioxide is the only cause of global warming Choice B:when leaves on the trees in the town usually change color Choice C:what proportion of global emissions of carbon dioxide is due to the burning of trees by humans Choice D:whether air pollution is causing some trees in the area to lose their leaves Choice E:whether unusually warm weather is occurring elsewhere on the globe more frequently than before