A war of attrition.
World War 1 is an example of this.
Since this is a timed test I'm pretty sure i'm too late to give the answer but it's C. Hope this helped (although i'm late)
Answer:
Scholars writing about historical events, people, objects, or ideas produce secondary sources because they help explain new or different positions and ideas about primary sources. These secondary sources generally scholarly books, including textbooks, articles, encyclopedias, and anthologies.
Answer: (B): free enterprise
Explanation:
meaning that supply and demand determine how our resources are used.
