PLEASE HELP ME BRAINLIES 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

As nina and erin were eating lunch in the central high school student cafeteria, they were discussing the news coverage about the girls' athletic coach being arrested for selling steroids to student athletes. "i think the guy just did it because they don't pay teachers enough money," nina suggested. "i bet the guy had some other kind of drug addiction he was trying to pay for," erin countered. nina and erin's ideas about the cause of the coach's drug-selling behavior are examples of: