Single/multi-select question: Does the sentence "The raids and devastation of the Goths and Huns in the 4th and 5th centuries and the Slavic invasion of Greece in the 7th century resulted in a dramatic collapse in imperial authority in the Greek peninsula." provide a valid answer to the question "What invading marauders caused havoc in the Balkans during the 4th century."
(a). yes; (b). no;
(b).