The answer would be. what the characters say about each other<span>what the author says about his or her own work
what one character says to another</span>
Answer:
C. people interested in developing a sound
Explanation:
The whole passage was about "Motown records" and their history of growth till date. That's what make interesting and the celebrities that these Motown Records featured. The other options like Music and history or research about the "Big Three" companies or someone interested in becoming like Lindsay Lohan. But the actual point of interest is people about the who are interested in developing a sound.