Britain, France, Spain, Netherlands, Denmark and Russia.
Probably he or she meant like how he ran his government or how he basically ruled his country.
Couldn’t find a direct answer, but D seems the most logical to me.
Hope this helps.
Unfortunately, you didn't share any following reasons so that someony could choose the correct one, but I am pretty sure that I can help you and name the main factor. Definitely, the point which caused a decrease in the size of the armed forces at the end of the cold war is that the US promised to decrease its armed forces as part of the peacetime agreement. I bet it will help you!