Answer:
The best answer is C, "Many people have been barred from opportunities based on race, gender, or ethnicity." While there have been some gains in terms of equal opportunities for people of different races, genders, and ethnicities over the past 20 years, there are still many barriers that prevent people from accessing the same opportunities. These barriers can include discrimination, lack of access to education or resources, and social and economic inequality. It is important to continue working towards greater equality and opportunity for all people, regardless of their race, gender, or ethnicity.