Final answer:
Feminist Theory focuses on how membership in groups shapes individuals' experiences, knowledge, feelings, and actions, as well as their understanding of social life as a whole.
Step-by-step explanation:
The theory that focuses on how membership in groups, such as those designated by gender, race, class, and sexual identity, shapes what individuals experience, know, feel, and do, as well as how individuals understand social life as a whole is Feminist Theory. Feminist theorists highlight the ways in which gender inequality and discrimination impact individuals' lived experiences and social interactions. They analyze power dynamics within society and advocate for gender equality and empowerment.