Trains have developed over the years as technology has improved. Now, there are electronic trains that do not need conductors to run them. These conductorless electronic trains are beneficial because , but they also have disadvantages such as .

Under the soviet system, the government a. controlled all forms of communication. b. allowed newspapers to print whatever they wanted. c. controlled editorials but not the reporting of news. d. encouraged access to a wide variety of news sources. select the best answer from the choices provided a b c d