What transformation occurred in French fire brigades around 1750?

The transformation that occurred in French fire brigades around 1750 was that they became paramilitary organizations. During this period, there was a significant shift in the structure and function of fire brigades, influenced in part by the need for a more organized response to urban fires and the growing complexity of city infrastructure. The paramilitary organization model allowed for better discipline, training, and coordination among firefighters, which was crucial in dealing with the increasing occurrences and impacts of large fires in urban areas. This structure helped ensure that fire brigades could respond more effectively to emergencies, which reflected a broader trend in public safety improvements during that era.

In contrast, the other options do not accurately represent the historical context: fire brigades were not privatized, disbanded, or merged with police; rather, they evolved to meet the demands of a changing urban environment, necessitating a more structured and disciplined approach.