Answer:
It is difficult to determine if any of the options are NOT examples of a successful overture, as they all describe characteristics that can be present in a successful overture. However, one possible answer that is NOT an example of a successful overture is:
D. It confuses the listeners and does not relate to the opera.
An overture is an instrumental introduction to an opera or other musical work, and its purpose is to set the mood, introduce the themes, and grab the audience's attention. A successful overture can leave the listeners content, introduce the characters of the opera, and grab the audience's attention. It should also be relevant to the opera and not confuse the listeners.