Questions 14 to i6 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.
What does the speaker say as a distinctive characteristic of jazz musician

A．They memorize their music before performing it.
B．They are more famous than performers of other kinds of music.
C．They perform their music as a means of individual self expression.
D．They possess detailed knowledge of the rules of jazz performers.