The Kingdom of Prussia (aka "Germany") and the Austrian Empire joined together to seize the territory of Schleswig-Holstein from Denmark due to the regions majority German population.
The correct answer is D, domestication of animals. All other alternatives refer to events that only happened later.
In order to affirm an Agricultural Revolution ocurred, historians have to choose the most important changes and events that determine that from that moment onwards life was different.
The most important thing that supports the idea of an Agricultural Revolution is that humans started to domesticate plants and animals, which made possible for them to settle and stop being nomads.
This lead to the birth of cities and to radically change how those people lived.
The telegram was considered perhaps Britain's greatest intelligence coup of World War I and, coupled with American outrage over Germany's resumption of unrestricted submarine warfare, was the tipping point persuading the U.S. to join the war
