Other composers music was used for ballet but wasn't actually meant for it. Beethoven was the first to actually compose for ballet.
So you're looking for 2 synonyms. B is the best answer, avert and prevent are synonyms of each other. The other choices are antonyms, or they're at least not synonyms.
A primary source is something from that time such as a diary or a newspaper article.
A secondary source is something written by historians
Hope that helps
B.) eating a lollipop
because the sentence is in present tense and choice A,B,and D is all past tense. Choice B. is the only present tense.