C is not correct. The designs usually represented family history.
A is not correct either. The base was usually elk and deer and a robe of buffalo fur in the winter.
D is actually an explanation for D.
B is probably the answer (another reason for hating multiple guess) although you have to know D in order to pick B. Hair was an acceptable decoration.
Answer:
Hitler and Stalin signed a nonaggression pact
Germany Invaded Poland
Poland surrendered
Britain and France declared war on Germany
Explanation:
most Europeans to leave the country
Basically too big to govern. The soldiers couldn't be everywhere at once, so they might be busy while the barbarians got through the borders. Plus, the emperor was struggling to pay his soldiers. Less soldiers.... meant less defence.