Change syntax highlighting colors for C source files

[Bob Johnson]

Hello everyone,
How would I change some of the syntax highlighting colors in Emacs? For example,
the argument of a printf statement in a C source file is highlighted in bright
pink. Since bright pink on a white background has very little contrast, I would
like to change the highlighting to something darker. I couldn't find where these
options were located in the Customize Emacs menu. Does anyone know how to change
these colors?
Thanks,
Bob Johnson