Final answer:
The best evidence of Vandross's love for singing is that he left college to pursue a music career, showing his dedication and passion.
Step-by-step explanation:
The statement from the passage that best supports the idea that Vandross loved singing is D. He went off to college at Western Michigan University but dropped out to pursue music after one year. This choice indicates that Vandross had a strong passion for music, strong enough to leave college to pursue it full-time. Choices A, B, and C describe his career achievements but don't directly reflect his personal feelings about singing.