Answer: The right answer is the C) A person who makes speeches and is good at doing so.
Explanation: Just to elaborate a little on the answer, it can be added that the word orator derives from the Latin orātor, -ōris, which can be translated as a person who speaks in public, delivers a speech or gives a lecture skillfully and with eloquence - the other three definitions are incorrect. This term is used by one of the Italian drivers that drove the ambulance with Lieutenant Frederic Henry.