The right choice to your question would be D. Splitting work equally between two people.
Answer: I would characterize the U.S. involvement in Vietnam as a failure of American foreign policy.
Explanation: The US caused a lot of their own troops to die and left several behind. They also gassed Vietnam which caused a lot of environmental damage, birth defects, deaths,cancers, and deaths. On the whole, the US failed their citizens and caused a lot of innocent people to be killed thus characterizing this as a failure of foreign policy.
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Answer: The Chaldeans adopted the Assyrian system of control of conquered peoples, of exchanging aristocracies between different areas, so the ruling aristocracy was unsympathetic to the locals and would not tolerate uprisings.