Answer:
in order to avoid any form of betrayal or deceipt, they need to set on rules to avoid loopholes or betrayal, it could also provide proof of the agreement and ensure that everything was done efficiently and without mistakes
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..."
There are five main causes to the civil war, Slavery, Economy, Federal versus State rights, Abraham Lincoln becoming president and the Battle of Fort Sumter.