Answer:
String family
Amethyst, black, cyan, denim, electric blue, fuchsia, green, hot pink, indigo, jade, khaki, lavender, ,magenta, neon blue, orange, purple, queen pink, red, sage, teal, ultra red, violet, wine, xanadu, yellow, zaffre
Explanation:
It's D
I think it should be called Race to the Cure or The Disease or something like that. Sounds like a great book hope you find a good title for it!!