The war in Iraq cost the United States about option c: $800 billion.
Why did the war in Iraq happen?
The United States was said to have use a rationale for the invasion on their claims for the reason they attacked was due to the fact that Iraq had a weapons that could lead to mass destruction (WMD) and as such they did posed a threat to the United States as well as their allies.
Hence, The war in Iraq cost the United States about option c: $800 billion.
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