Answer:
Option A.
Step-by-step explanation:
Augustus, is the right answer.
The Republic in Rome became the Roman Empire at the time when Augustus came to the throne of Rome. He was the first ruler who installed the autocratic form of government in Rome. In this form of government, he became the sole ruler to make all the judgments. During the time, when he came to power the territorial expansion was on a great extent. Accordingly, he did not try to expand the territory of the empire.