A、Because he had to stand in front of the music hand of the military. B、Because he had to face the back of the horse while leavi

Let’s talk about the stories with expressions that include the word "face".
    The first is "face the music". It means to accept the results of what you have done. Here is an example from a Reuters news report: Britain’s highest court had ruled that former Chilean dictator Augusto Pinochet was legally arrested. Opponents of General Pinochet welcomed the news. one of them said, We have waited for years for this man to face the music. No one is sure how the expression began (26) . one story is that it came from a military ceremony held when a soldier was forced out of an army.  The buttons were cut from the soldier’s clothing. He was put on a horse, facing the back of the horse and led away. As he left, he faced the music of a military band and the soldiers he had served with (27) . Another story says the expression began in the theater. New actors, shaking with fright, were told that the only cure was to go out and face the music. The music was played by the orchestra seated in front of the stage.
    Another expression is "as plain as the nose on your face". It means that something is as clear as it can possibly be (28) . Shakespeare used the words almost five hundred years ago for a joke in his play Two Gentlemen of Verona. Valentine secretly loves Lady Sylvia. His servant jokes that Valentine’s love for her is as hard to see as the nose on a man’s face. Of course, a man’s nose can not be hidden.