Prior to the 1900s, what were the main sources of transportation in cities? (first to awnser will get brainliest) a. electric trolleys and subways b. boats and streamlines c. elevators and radiator power d. horse or mule carriages and steam-powered trolleys

The correct answer is - D. horse or mule carriages and steam-powered trolleys.

Prior to the 1900's the main transportation sources in the cities were the horse and mule carriages and the steam-powered trolleys. Most of the intercity transport was taken out by the horse and mule carriages which dominated the streets of the cities, they were still the easiest, most efficient, and cheapest transport. The only competition of the carriages were the steam-powered trolleys, and they were the most technologically advanced transportation for intercity transport at this period of time.