B they tend to promote because training and getting people ready takes a lot and they want to keep them there as long as possible instead of paying to retrain people all the time
I think it is supposed to be C. Chapters given the context clues being a book
Some positive affects music can give to you is it can make you happy or persistent in something, but music can also be distracting sometimes and it could also make you sad.
sorry if i did this completely wrong
