【单选题】

Questions 17 to 20 are based on the following passage.At the end of the passage, you will be given 20 seconds to answer the questions.

Now listen to the passage.
What evidence do people from the west give to show that a higher speed limit is safeA．The long roads between the cities.
B．The modern turbo-charged engine.
C．The economic advantage.
D．The current policies of Germany andAustrali