Critics of unidimensional evolutionary theories argued that a. all societies follow the same path to development. b. not enough emphasis was placed on studying civilized societies. c. "civilized" and "primitive" do not have clear definitions. d. it is less complicated than multidimensional theories.

The answer is letter c, civilized and primitive do not have a clear definition. It is because this theory focuses more on the evolution of societies in which civilized and primitive does not have a clear definition of how it is connected with this theory.

answer; i believe the correct answer is enlightenment;