Which act prohibits discrimination on the basis of race, color, religion, sex, or national origin?

The correct choice is Title VII, which is part of the Civil Rights Act of 1964. This specific title prohibits employment discrimination based on race, color, religion, sex, or national origin. It is aimed at ensuring equal opportunity in the workforce and prohibits discriminatory practices in hiring, firing, and compensation among other employment practices.

Title VII is a crucial piece of legislation that provides a framework for individuals to seek legal recourse if they believe they have been discriminated against on the specified grounds. It helps in promoting a fair work environment and supports efforts to address and remedy discrimination in various facets of employment.

Looking at the other options, Title IV and Title IX address different aspects of civil rights; Title IV focuses on nondiscrimination in publicly funded education, while Title IX specifically prohibits discrimination on the basis of sex in educational programs and activities that receive federal financial assistance. Title VI, on the other hand, protects individuals from discrimination based on race, color, or national origin in programs or activities receiving federal financial assistance, but it does not encompass discrimination based on sex or religion.