Answer:
C). Brünnhilde.
Step-by-step explanation:
Inverted commas(" ") are employed to mark the beginning and end of the quotation. It is usually employed around the terms or titles in order to highlight or emphasize the readers' attention towards it.
The words that must be inside the inverted commas would be 'Brünnhilde' as it is the title of the term that is being discussed. The passage discusses that the term 'comes from the opera Der Ring des Nibelungen.' It discusses that the 'Brunhilde opera' involves 'sixteen-hour painfully long run time' which is 'played by a large woman.' Thus, option C is the correct answer.