This selection is mainly about Magic Johnson and
A when he changed his diet and exercise to live with HIV.
B where he became friends with Kareem Abdul-Jabbar.
C how he became a successful athlete, business person, and activist.
D why he started a business after choosing to quit playing basketball.
The correct answer is C: how he became a successful athlete, business person, and activist.
Explanation: The selection primarily focuses on the various roles and achievements of Magic Johnson throughout his life, including his impact as an athlete, his ventures in business, and his efforts in activism, particularly regarding HIV awareness. This comprehensive portrayal illustrates his multifaceted contributions to society beyond just his basketball career.