What change did Augustus introduce that weakened the power of th

What change did Augustus introduce that weakened the power of the Roman Senate?
A、He increased the number of senators.
B、He reduced the number of elections.
C、He gave more authority to the people's assemblies.
D、He appointed himself as the Princeps, or 'first citizen', concentrating more power in his own hands.
【正确答案】：D
【题目解析】：He appointed himself as the Princeps, or 'first citizen', concentrating more power in his own hands.