When We Say That Japan Is a Constitutional Monarchy, We

When we say that Japan is a constitutional monarchy, we mean that

A) the monarch alone can amend the constitution.
B) the monarch is the formal head of government although as a practical matter, executive power is exercised by the prime minister.
C) the monarch serves only a ceremonial symbolic role.
D) the Japanese parliament chooses the monarch.
E) the monarch has a constitutional power to veto laws approved by parliament but he has never exercised this.