The correct option here would be the third option.
It is only in the parliamentary states that the prime minister acts as the head of the national government. Here the head of state and the head of government are two different people as opposed to the presidential system where the president is both. A good example of a parliamentary state is Canada while a good example of the presidential state is the US.
It's funny i was ask this question just yesterday and the answer is C. the empire had grown so large that the ruler decide to split it
How many continents,you mean?
Answer is 3. Europe, Asia, Africa.