Which of the following is a possible explanation for China's incredibly smooth real GDP growth? O A. China must be accounting for the greater pollution problems it experienced as its level of GDP increased. B. China is most likely counting both intermediate and final goods when it measures the nation's GDP. O C. China may be targeting a specific rate of growth and then pushing the nation's real GDP toward that growth target. O D. There are no possible explanations for China's smooth real GDP growth. It is simply too smooth to be believable