The emperor restored stability to the roman empire.
a.
otho
c.
vespasian
b.
titus
d.
nerva

Vespasian

Vespasian struggled laboriously to reconstruct order, peace, and self-respect to Catholicism after the civil war. He ascertained the new, Flavian dynasty.  Vespasian was a human of moderately humble roots and performed on these roots to prominent political influence. Vespasian's important aspirations throughout his rule were to rebuild Rome's economics after Nero's destructive reign, to reestablish order in the army after the civil wars and to guarantee the also want to make sure that Titus should make succession after his reign.

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a. poison gas was sprayed over battlefields by airplanes to weaken enemy positions before major attacks.