Which of the following can be used to investigate the reason the assassination of Archduke Franz Fernand sparked World War I
1. Historical documents and archives related to the assassination of Archduke Franz Ferdinand and the events leading up to World War I
2. Primary sources such as letters, diaries, and eyewitness accounts of the assassination and its aftermath
3. Military and political analyses of the alliances and rivalries between major European powers at the time
4. Studies of the socio-political climate in Europe in the early 20th century
5. Comparative analyses of other historical assassinations and their impacts on world events