单项选择题

Questions 18 to 20 are based on the following passage. At the end of the passage, you will be give 15 seconds to answer the questions.
Now listen to the passage.
Up to the 1920’s, what was one objection to the films

A.They were silent.
B.They didn’t tell a complete story.
C.They were too expensive.
D.They were too short.