C.rhythm
because it can speak for it self and tell you that you worked hard on it if it has rhythm.
Answer:
The answer would be using a digital projection system
Explanation: Because they are in a theater, and a digital projection system would be best to use.
Hey there!
The correct answer is C.
The most famous castratl was Farinelli.
Farinelli was an Italian singer born January 24th 1705, and died September 16th 1782.
Hope this helps you.
Have a great day! :)