Answer: I think they never said they could... but I don't know history-
Explanation: The Open Door policy was a statement of principles initiated by the United States in 1899 and 1900. It called for protection of equal privileges for all countries trading with China and for the support of Chinese territorial and administrative integrity. The main reason the United States announced the Open Door Policy is to ensure that U.S. businesses could operate in China. The backlash against foreigners led to widespread killings of missionaries working in China and an increase in nationalist feelings among the Chinese. The Boxer Rebellion was one of the most important events caused by this anti-foreign movement.
D, because the answer is in the question : "a statistic is given that says how many boxcars could be filled with the garbage is dumped into earth's water..."
Most were located in the Northeast because merchants there had money to invest in new mills. Also, this region had many rivers that provided a reliable supply of power. In the South, investors concentrated on expanding agriculture.
