I think it would be C because he says how he believes it makes them happy, but there is no proof that animals are happy when they have crowd cheering them on.
ANSWER:
D. Using historical research ensures that you create original work and use appropriate details.
This will ensure that you are aware of historical facts and so don't produce work which is similar or the same as what is written in the past. As well as this, it will ensure that you are respecting the details and facts of historical events and that your work makes sense.
Answer:
You could get info on Mozart from Wikipedia, biography.com, britannica.com, classicfm.com, newyorker.com, classicsforkids.com and naxos.com.
Hope it helped.