Answer:
Among the options given on the question the correct answer is option C.
Chief of state.
Explanation: The President of USA has several roles played by him. The president of USA is the Commander In Chief of the Army and the Chief of the state. The President is also chief executive of the country. He is responsible for executing and enforcing any law,policy enacted by the Congress in regards with both the foreign and domestic.
Moreover the President has the right declare or treaty with any nation as the Commander in Chief of the Army.So the military power belongs to the President.
But in described scenario,if President of US visit to a newly democratic country in their election,meet leaders and give speech he is playing the role of the Chief of State of USA. Because he is representing as the Head of USA in the foreign country.