To say that all African-American males are fast runners is an example of

A-Prejudice
B-Sexism
C-Stereotype
D-Bias

C-Stereotype

The correct answer is C - Stereotype

A stereotype is a widely held but oversimplified belief or idea about a particular group of people. In this case, the statement suggests that all African-American males are fast runners, which is a generalization and does not take into account individual differences or abilities. Stereotypes can perpetuate unfair assumptions and perpetuate prejudice and bias.