Answer:
B) The area was easy to attack and invade.
Step-by-step explanation:
When we want to determine if a country has good natural defenses against invasion we look at the geography. We look for tall mountains or deserts or rivers and swamps or cold winters and so on. They didn't really have such natural barriers against their enemies. They didn't have things to prevent them from trading so A and D is not the answer and they did herd animals.