Use the graph below showing the cost of wars in the 20th century to answer the following question: (This is a line graph showing the cost of wars in the 20th century. It shows WWI cost 20 billion dollars, WWII cost 296 billion dollars, Korea cost 30 billion dollars, Vietnam cost 111 billion dollars, and the Persian Gulf War cost 61 billion dollars. ) Which is the best explanation for why the Cold War is not included in this chart? A: Since the Cold War didn't involve fighting, there was no money budgeted or lost in fighting the Cold War.

B: Because the Cold War is just another name for the Vietnam War, that cost is included in the graph.

C: The Cold War was not a conventional war, and its costs are measured by the individual proxy wars.

D: It is included in the costs of World War II as part of the global post-war recovery.