Final answer:
Rita is most likely a supporter of feminism, a movement advocating for gender equality and challenging sex-based discrimination in the workplace and beyond, as demonstrated by her protest against the restaurant's policy.
Step-by-step explanation:
Rita is most likely a supporter of feminism. The actions described in the question align with feminist principles of striving for gender equality and opposing sex-based discrimination. Activists like Shulamith Firestone and Betty Friedan have historically fought against such discriminations by advocating for equal opportunities for women in various sectors, including employment.
Feminist theory argues against the traditional patriarchal systems that often place men in positions of power while relegating women to subservient roles. Throughout history, women have engaged in protests and demands for equal rights, from labor equality to having a voice in political and public spheres.