Which of these would have had a major impact on the development of the streetcar and the electric trolley in the late 19th century a: dwindling urban population b: migration to the great plains c: fewer opportunities for farmers d: great mobility within big cities

The correct answer is D) great mobility within cities.

The option that would have had a major impact on the development of the streetcar and electric trolley in the late 19th century is great mobility within cities.

Good means of transportation have always been a priority and a necessity in large cities such as Los Angeles, New Yor, or Chicago. Mobility and safe transportation are always demanded by citizens. So with streetcars and trolleys, and then later the subway transportation system, mobility in large cities benefited a lot. For street cars, the construction of modern highways also helped people travel fast and safe to their destinations.

i would say your answer is a)

sorry if im wrong