>>31Well, C is simple and has low-level features.
C being high-level usually means "Lisp compiles to C code that would be impractical to write manually", that is C has the option of being at any level of abstraction, if programming time isn't a problem its possible to reimplement anything in C.
However because C binds to low-level idioms easily, its used as low-level byte twiddling tool more than anything complex.