Answer:
The correct option is: "imperialism, militarism, and entangling alliances"
Imperialism: In 1914, Europe was at the zenith of world domination. After the Industrial Revolution and the demographic explosion, Europe had managed to establish a political, economic and military domination worldwide, based on an overwhelming technical and intellectual superiority.
System of alliances: Throughout the nineteenth century, the major European powers made a great effort to maintain the balance of power throughout Europe, resulting in a complex network of political and military alliances across the continent for the early twentieth century.
Militarism: After the German unification and the foundation of the German Empire in 1871, after the Teutonic victory in the Franco-Prussian War, the German industrial and economic power grew enormously and with it the arms race was launched.
Explanation: hope ths informaton helps in the slightest