What marked the official transition from Roman Republic to Roman Empire? 1)

When Gaius Marius began his rule as Consul

2)

When Augustus, formally known as Octavian became Emperor of Rome

3)

When Sulla marched on Rome and declared himself dictator

4)

When Tiberius beliefs threatened the Senate and gained support of Rome's underclass

To retort, pertaining to reinstating your interrogate, the preeminent proximate contiguous veracious retort is 2.

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The answer is number 2, When Augustus, formally known as Octavian became Emperor of Rome

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b) to encourage free trade

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