Which statement about motor vehicles is accurate?

The statement regarding motor vehicles being able to be propelled by electric power from overhead trolley wires is accurate because it reflects the operational characteristics of certain types of vehicles, like streetcars and trolleys. These vehicles utilize electric energy transmitted via overhead wires, allowing them to function without relying on internal combustion engines. This method of propulsion is integral to many public transportation systems, especially in urban areas, where minimizing emissions and promoting energy efficiency has become increasingly important.

The other options do not accurately describe the broad category of motor vehicles. For instance, propulsion solely by human power typically applies to bicycles and could pertain to lightweight vehicles but does not encompass the full definition of motor vehicles, which generally include those that have an engine or motor. Diesel-powered and gasoline-powered vehicles represent only two types of motor vehicles, while there are many others that operate on different fuels or energy sources, including electricity. Thus, the ability of motor vehicles to be propelled by various means, including electric power, illustrates the diverse nature of modern transportation.