Final answer:
Leonard Raven-Hill's cartoon 'The Boiling Point' aimed to convey that uprisings in the Balkans needed to be contained to prevent threats to the great powers. This reflects the broader concerns of the period about nationalism and imperial ambitions leading to larger conflicts.
Step-by-step explanation:
The political cartoon 'The Boiling Point' by Leonard Raven-Hill was an insightful commentary on the precarious situation in the Balkans during the early 1900s. Raven-Hill, a supporter of British imperialism, was portraying the view that European leaders needed to keep tensions in the Balkans under control.
The cauldron symbolizes the tumultuous region, while the leaders sitting on its lid reflect their attempts to suppress the rising nationalistic and imperialist tensions. Therefore, the message he tried to convey is most closely related to the first option: Uprisings in the Balkans must be contained, or the great powers could be threatened.