Drag and drop events to list them in order from first (top) to last (bottom). huns attack the empire and drive german peoples ahead of them. odoacer topples romulus augustus. imperial crisis leads to civil war. roman forces withdraw from britain as goths attack rome.

The imperial crisis leads to civil war (The crisis of the third century (also known as anarchy of the third century, military anarchy or imperial crisis) refers to a historical period of the Roman Empire, fifty years, including death of the emperor Alexander Severe, in the year 235, and the ascent of Diocleciano to the throne of the Empire)

The Roman forces withdraw from Britain when the Goths attack Rome. (The looting of Rome on August 24, 410 was an action carried out by the Visigoths, commanded by Alaric I after expugging the city walls.)

Odoacer overthrows Romulus Augustus (Odoacer also known as Odovacar, possibly derived from the German Audawakrs "who seeks wealth"; c.433-493), of origin Hulus and Esciro, was the head of the Germanic tribe of the Heruli. He disposed of the last Roman emperor of the West, Romulus Augustulus, in 476, becoming King of Italy.)

The Huns attack the empire and lead the German peoples ahead (The Huns (Vulgar Latin: Huni, also as Chuni, Medieval Greek: Oúnnoi / Οὕννοι), constituted a confederation of nomadic and semi-nomadic peoples, from various ethnic branches coming from the steppe area, along with conquered or assimilated groups in the Balkan area The importance of the Huns lies in the late creation of an authentic apparatus of power, capable of competing, in attributions and influences, with the two split halves of the Roman Empire , threatening both Constantinople and Rome at the same time)

the best answer is b.

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