Answer:
B. Events preseding Worl War I
Explanation:
The immediate cause that led to the outbreak of the First World War was the assassination of the Austrian-Hungarian Archduke Franz Ferdinand in Sarajevo Serbia on June 28, 1914.
The real factors that triggered World War I were the intense nationalist spirit that spread throughout Europe throughout the 19th and early 20th centuries, the economic and political rivalry between different nations and the process of militarization and dizzying arms race that characterized international society during the last third of the nineteenth century, from the creation of two systems of opposing alliances.
