D. is wrong. It should be "One hero in the animation field is Mel Blanc, the voice behind many cartoon characters." because the information after Mel Blanc is not necessary to the sentence. It's just extra, so you need a comma.
Elongated hyphens in this excerpt are most likely used
To indicate an approval of the normal flow of ideas
Answer:
astronomy is the correct answer
I believe it is:
adjective phrase=of great price
noun modified=pearl.