Which of the following is an example of overt discrimination?

B is the correct answer because overt discrimination refers to explicit and observable actions or behaviors that manifest discrimination against individuals or groups based on characteristics such as race, gender, or nationality. Public racial slurs are a clear example of overt discrimination as they are blatant expressions of prejudice and bias that can be directly seen and heard in social interactions. This kind of behavior not only shows a lack of respect for the targeted group but also reinforces societal norms that can perpetuate inequality.

In contrast, the other options, while they do reflect forms of discrimination, are more subtle or systemic in nature. Subtle microaggressions, for instance, can be defined as indirect or unintentional discrimination that may be more difficult to identify and address. Discriminatory policies refer to rules or regulations that result in unequal treatment but may not be overtly manifested by individuals in a direct confrontation. Social exclusion involves the act of isolating certain individuals or groups, which can be a form of discrimination, but it does not necessarily involve explicit, observable actions like public racial slurs do.