The rhythm of early notated music came from: the notation. Option letter B is correct since it made the music change the whole world. Many music notes were changed and added due to the evolution of music and its accompaniment.
There is no picture to see to answer the question.
I believe that finding the balance of drones would be putting a limit on how many drones a country can use at one time. I'm not sure on the other 2 questions.
Answer: okay I’m too lazy to type it down but just look at the picture :)
