What Was a Consequence of the Withdrawal of Roman Armies

What was a consequence of the withdrawal of Roman armies from Britain?

A) Celtic Britons were able to overrun the island.
B) Angles and Saxons, Germanic tribes from Denmark and Germany, were able to invade and to establish new kingdoms on the isle.
C) Medieval Scottish culture was established.
D) Local Roman elites rebuilt English Latin culture.
E) Someone later known as King Arthur drove the Vikings from England.