The student clearly stated an appropriate and specific question for the historical investigation, focusing on the significant relationship between the Chernobyl disaster and the collapse of the Soviet Union. However, the question lacks a clearly defined scope regarding the date of the disaster, which is essential for framing the investigation. The student appropriately selected relevant sources and effectively explained their relevance, though they did not categorize the sources as primary or secondary. The student provided a detailed analysis of the values and limitations of the origins and content of the sources, but fell short in analyzing the purpose behind the sources comprehensively.
