They didn't. It's still going on
At that time, Persia was the largest empire the world had ever seen. Its powerful kings ruled over lands in Africa, the Middle East, and Asia. During the 400s B.C.E., the Persians invaded Greece, and the Persian wars began.
By 1000 CE, Europe has not emerged out to be a strong and unique nation as how it is today. French Capetian Dynasty was the only kingdom which started to emerge between 1000 to 1400 CE.
Spain was under the control of Muslim Caliphates at that time.
Many tribal people of Germany who belonged to present day Denmark and Saxons from north Germany invaded Britain in 1000 CE. Roman rule of Britain disappeared gradually and what was remained was distributed among Anglo Saxons.
Answer: I believe the answer is “B.”
