How did new technologies affect motion pictures in the 1920s?

Motion pictures were now produced exclusively in color.
Motion pictures could now be viewed at home.
Motion pictures could now be shown in sports stadiums.
Motion pictures could now be produced with sound.

Which instance of political expression would be considered symbolic speech? a. a student wearing all black to call attention to political issues b. a candidate for congress giving an interview to the media c. a demonstrator chanting anticorporate slogans outside a company’s headquarters d. a local citizen speaking up at a town hall meeting