The correct answer is A) Head of state.
When Queen Elizabeth II of Britain hosts a dinner for the president of France, she is playing a role most similar to the role played by the President of the United States as Head of state.
One of the most important roles of the President of the United States is being the Head of State when he welcomes another President, Primer Minister, King, or King. The US President also is teh Chief diplomat of the nation.
That is why in this kind of diplomatic event, the official protocol states that it is the President the most important figure of the government -as in the case of Queen Elizabeth II- the ones that act as the highest diplomatic representative of the country.
It is believed that today’s emperor of Japan, and indeed all emperors in the history of Japan, is descended from "Amaterasu" who is an ancient Sun Goddess.
Mainly for transportation purposes
