Which of the following is an example of discrimination in the labor market?

a. Women earn less than men because women are more likely to be employed in occupations that pay less, such as elementary school teachers rather than electrical engineers.
b. Women earn less than men because women have, on average, fewer years of experience in the labor force because women, on average, periodically leave the labor force to raise children.
c. A pharmaceutical sales company pays women less than men because the company's customers, physicians and pharmacists, say that they prefer to deal with men rather than women.
d. All of the above are examples of discrimination.

c