【单选题】

{{I}} Questions 18 to 20 are based on the following passage.At the end of the passage, you will be given 15 seconds to answer the questions. Now listen to the passage.{{/I}} 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.