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. Why did many southerners go to the Northeast and the Midwest during World, War Ⅱ
A．They wanted to learn to like country music. B．They wanted to take music with them. C．Country music was popular all over the country. D．They wanted to work in the factories there.