In addition, the development of the film for longer movies. Now large groups could sit in comfort rather than stand at a cabinet, even though the typical rickelodeon movie screen was often a white bed sheet. Why did the invention of the film projector lead to a radical change in the way films were shown? A Live acts performing before and after movies could be filmed B Movies could be watched lin rooms that were not darkened C Musical accompaniment for movies was no longer necessary. D Films could be projected on a screen before large groups.

The invention of the film projector led to a radical change in the way films were shown because films could be projected on a screen before large groups. This allowed for more comfortable viewing experiences for larger audiences, as they no longer had to stand to watch the movie. The passage mentions that before the invention of the film projector, people had to stand to watch movies, which was not ideal. With the film projector, movies could be projected onto a screen, allowing for a more comfortable and enjoyable viewing experience for larger audiences. Therefore, the correct answer is D.