Which of the following are the main factors that led to World War I?

the assassination of Archduke Franz Ferdinand by a Serbian and alliances between countries
arguments about workers’ rights
the invention of nuclear weapons and disagreement over their use

The main factors that led to World War I were:

- The assassination of Archduke Franz Ferdinand by a Serbian nationalist, which sparked a diplomatic crisis and eventually triggered the war.
- Alliances between countries, particularly the complex system of alliances formed among European powers, which created a web of obligations and commitments that escalated the conflict.
- Tensions and rivalries between major powers, including territorial disputes, economic competition, and militarization, which heightened the likelihood of conflict.
- Nationalism and imperialistic ambitions, where countries sought to expand their territories and assert dominance.
- Failure of diplomacy and the inability to peacefully resolve disputes and conflicts.
- Arms race and increased military capabilities, as countries developed and modernized their armies and weapons.
- Failure of the international system, including weak international institutions and the lack of effective mechanisms for conflict resolution.