D) the United States and the Soviet Union
Because the brain s so big and in so many ways unable to explain all the phenomena that occur. And unlike physical problems, psychologicalis often impossible to have in emotion and undoubtedly impossible to observe.
I never reviewed this in class but I do remember that my teacher said that Rome had a strong army. I know its not B, C, and I don't think its D.
Hopefully this helped you.
Answer:
D
Explanation:
It were the times of nationalism in europe(Italy, Germany etc.), I highly doubt that it wouldn't be that.