A adjective phrase is a phrase the head of which is an adjective.
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.
Life is like riding a bicycle. To keep your balance you must keep moving.
