Answer: Britain
During the early 20th century, Britain was considered to be one of the most powerful and biggest empire on Earth. Almost one-fifth of the Earth's landmass is occupied or belong to Britain. The vast space that they has become a big advantage for them.
The Best Explanation for why the Cold War is not Included in the chart Is because:
~That was not a Conventional War, and its Costs are Measured by the Individual Proxy Wars.
Hope this helps.
Answer:
The correct answer might be A.