The correct answer is C) Catholics have a pope, Protestants do not.
One of the major differences between Catholic and Protestant theology is that Catholics have a pope, Protestants do not.
Of course, there are many differences between Protestant and Catholic religions. But one of the most notable differences is that the Catholic Church is led by the pope in Italy; the Vatican, to be more specific. Protestants do not have a pope.
Indeed, that was one of the main reasons for the separation or the split of the church. German monk Martin Luther accused the pope and the Catholic church of selling indulgences and he critiqued this, saying that it was not moral and correct. He wrote this and other interesting ideas in his essay "95 Theses."