Answer:
There was a senate; however, Augustus maintained power over all bodies of government.
Step-by-step explanation:
After the death of his uncle Julius Caesar, Caesar Augustus became the ruler of the Roman empire. He was the adopted son of Julius Caesar who made him his heir after his death.
Augustus brought an autocratic form of government after he became the ruler. He put all major power on himself, overlooking major decision making upon himself. There was a senate in the empire but they were more or less powerless under Augustus who took the role of major decision making to himself.
Thus, the correct answer is the fourth or last option.