The best and most correct answer among the choices provided by the question is the first choice. There was a rise of fascism in Germany because of their d<span>efeat in WWI and the Treaty of Versailles that punished Germany and forced them to pay reparations. </span>I hope my answer has come to your help. God bless and have a nice day ahead!
Answer:
When Austria-Hungary declared war on Serbia, it led to Russia declaring war on Austria-Hungary as well because Russia was in an alliance with Serbia.
Germany which had an alliance with Austria-Hungary via the Triple Alliance then declared war on Russia.
Russia was already in an alliance with Great Britain and France known as the Triple Entente and when Germany declared war on Russia, Great Britain and France declared war on Germany.
Thus began the Great War.
Following the rivers was a good strategy in the idea that they wouldn't need to cross the river too many times. Crossing the rivers was hazardous, and many lives were lost if the waters weren't shallow.
Additionally, it was a source of drinking water, and a gathering place for animals they could hunt for food.