Americans were uneasy about rapid social change and supported traditional religious beliefs.
your answer would be formal !!!!!!!!!!!!!!!!!!!!!!!!
I think its going to be the 2nd option class's. even the you usually put an apostrophe after the s when the noun is plural, I believe class's is a collective noun in this place which take a singular approach with apostrophes
A. Because if you made a summary about the passage, you would not include that minor detail so B is incorrect. Drug abuse/addiction is the main idea, so c is incorrect. In conclusion, A is correct