Which of these forms of transportation was not an innovation that used rails? the subway the automobile the elevated train the streetcar the trolley

The correct option is "the automobile "

The term automobile is used par excellence to refer to passenger cars. In a more generic definition, it refers to a self-propelled vehicle intended for the transport of people or goods without the need for lanes. There are different types of cars, like trucks, buses, vans, motorcycles, motocarros or quads.

c) troops march forward in close formation against newer, more accurate weapons