Which of the Following Is an Example of Workplace Discrimination

Which of the following is an example of workplace discrimination?

A) Nate,a young manager,is passed over for a promotion in favor of John,who has worked with the company for 30 years.
B) Bob is ignored when the manager selects female employees as project leads as the manager prefers that female employees lead teams.
C) Roy has to work more hours a week than Kara,a working mother.
D) Employees who drive electric or hybrid cars in Lee's company get better parking spots than employees who drive other cars.