The region of the United States most harmed by acid rain is the East Coast, including the Appalachian Mountains and the Northeast
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The correct answer is C. American intervention remains unpopular among some Afghan groups.
Explanation
An argument is a way to express oral or written reasoning to demonstrate the validity or invalidity of an estate through its relationship with a set of conclusions. Therefore, it can be said that an argument to demonstrate opposition to the establishment of US troops in Afghanistan is "C. American intervention remains unpopular among some Afghan groups" because this shows a negative conclusion of said action.
The answer is b EU created a free trade agreement
If resources get low, the population's numbers can decrease.