(A) describes what might happen if Huns, Goths, and Visigoths were to invade
(B) describes what would happen if Huns, Goths, and Visigoths invaded
(C) describes what would happen if Huns, Goths, and Visigoths would have invaded
(D) describe what might happen if Huns, Goths, and Visigoths were to invade
(E) describe what happen if Huns, Goths, and Visigoths invade
Solution
Subjunctive + Parallelism
Recent essays(plural) describes(plural) structure must be followed to maintain parallelism.
Hence, A, B, and C are incorrect because they are not parallel.
It is a case of past subjunctive and therefore, were must be used after if.
Hence, E is incorrect.
D is the best choice.
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