Whilst all the answers given here are correct in some way, the correct one is still A, preventing a war in Vietnam. The 60s were a hippy era, the pacifist movement against wars. And since the war in Vietnam lasted for 20 years, it is obvious that that is the thing which colored their lives black and something they stood against the most.
The answer is C. This is because but is being used as a conjunction separating independent clauses in the other answers. You can remove but from A, B, and D, and you are left with 2 simple sentences.
I hope this helps!!!
D. is the answer hope this helps
During Shakeaspeare time, people actually believed in witches and demons. They were extremely superstitious, and mystical/supernatural beliefs affected their everyday lives. If someone was ill, it was not uncommon to believe that person was cursed, for example. So seeing the supernatural being represented on a stage was especially frightening, which is also why magic and the supernatural are a recurring theme in Shakespeare plays.