C, because why buy a picture when you can take a photo of the real thing, it made the realists efforts pointless.
The Three Emperors League in 1872 was between Alexander II of Russia, William I of Prussia, and Francis Joseph of Austria-Hungary.
The agreement was renewed in 1881 with Alexander III replacing Alexander II of Russia. William I and Francis Joseph remained as signatories.
Technology made manufactering more efficient. Hope this helps
Answer:
“A rapid increase on the population” or “Rapid social and the creation of elite classes of rulers”
Explanation: