The correct answer is A. An area or political unit in which formerly independent states are under the control of one ruler
Explanation
An empire is a multireligious, multicultural and multiethnic state that controls at least part of its territory by annexation conquests and ruled by a ruler or emperor. In addition, it maintains a constant expansion as long as there are no pressures or internal economic (a period of crisis), political (fall of the dominant elite) or military conflicts (invasion by another State). Moreover, empires are the result of historical processes that make different states to become a unit or form a single larger state. So, the correct answer is A. An area or political unit in which formely independent states are under the control of one ruler.
The Last Supper, I believe this is the right answer.
A parliamentary system would most likely have multiple political parties vying for the electorates votes. Under a parliamentary system there are a multitude of parties and there is a process of coalition forming to create government's to decide on positions such as the precedence or the prime minister.