Which of the following is a reason why it is difficult to estimate the extent of economic discrimination in the labor market?
A) Employers who discriminate are likely to do so in overt ways such as awarding some workers with benefits-in-kind.B) Ultimately, employers who discriminate cannot remain profitable.C) Employers who discriminate pay an economic penalty.D) Differences in wages can be attributed to many other factors as well, such as differences in productivity and preferences.