This argument repeats a variation of a well-known LSAT structure: Some people think X... but... they are wrong.
Here, we have "Some studies say these operas reinforce in our society stereotypes about women". The author then relates the fact that nobody ("a small minority") watches opera.
Where is the author going with this? You got it - those studies are wrong! These operas have NOT reinforced stereotypes.
Let's look at the answers;
(A) opposite of what we want
(B) we have no evidence to suggest the author believes this
(C) ding ding! We have a winner.
(D) too broad -- it's not about "opera" -- it's about THOSE operas.
(E) While this might be an assumption required to get to the conclusion we predicted/identified, it is not the conclusion itself.