Which of the following actions is not protected under the Civil Rights Act of 1964?

The Civil Rights Act of 1964 prohibits discrimination based on race, color, religion, sex, or national origin in various areas, including employment. Actions that involve firing someone based on race or religion fall under this act and are deemed unlawful discriminatory practices.

In contrast, firing a worker based on job performance is generally considered a legitimate reason for termination that is not covered by this act. Job performance-related dismissals are typically evaluated on factors such as the employee's skills, contributions, and behavior in the workplace, which do not relate to the categories protected under the Civil Rights Act. Therefore, actions that stem from job performance issues do not invoke the protections provided by the Civil Rights Act, making this the correct response to the question.