The British, it was a success.
The Vietnam War. The USA became involved in Vietnam because it feared the spread of communism. The USA were unable to defeat the Vietcong and were met with growing opposition to the war back home.
Answer:
To be honest, I would say that all these answers could the right one, but if I had to choose one, I would say that the answer is B: It allows propaganda to reach more people.
Explanation:
If this is wrong, I am sorry. I think this because you could almost fit A and B together, but you could also fit C and D together, but in the total context, social media targets people. It catches their attention. So I went with the answer that included people as a whole.
I hope this helps!