The first alternative is correct (A).
Japan has the democratic system of government. It is a country governed by a parliamentary monarchy whose main figure is the Emperor, who is the head of state. Since 1989, when the Heisei Era began, this post is exercised by Emperor Akihito. Since the Second World War, the role of the Emperor has been purely ceremonial, and it is up to the parliament to make the decisions of the country.
