Which of the following statements best characterizes the opportunities available to people worldwide during the past 20 years?
a. people of all races, genders, and ethnicities have experienced equal opportunities.
b. people from some ethnic, racial, and gender groups have chosen to limit their own opportunities.
c. many people have been barred from opportunities based on race, gender, or ethnicity.
d. many people have been treated unfairly because of their ethnicity but not because of gender or race.