C. performers
Comedians, actors, and musicians all fall under the umbrella of being a performer in some way, making this the most general category here!
Extra words in a sentence that add detail and are set off by commas are called nonessential elements. This is because they are not essential to the sentence and story, they are simply an added bonus, without them the sentence still makes sense.
Answer:
that's cool and very great
good to hear that!
