Select the correct text in the passage.
Which phrase best indicates the passage’s main idea?
A recent report revealed that about 70 percent of American silent films are lost. With the arrival of talking films in the 1920s, silent films became unprofitable. So film studios threw away most of them. Some films were saved, but many of them were later lost in fires caused by the nitrate in film reels. Several other films were destroyed when they were recycled for their metal content.
help :D