Final answer:
The trans community challenged the exclusion of transgender issues within feminist theory and activism.
Step-by-step explanation:
The trans community challenged a particular aspect of feminist theory and activism that excluded or marginalized transgender issues. Prior to the 1990s, many mainstream feminist organizations focused primarily on women's rights and did not adequately address or include the rights and experiences of transgender individuals. However, transgender activists began advocating for their rights and integrating their issues into the broader LGBTQ+ movement, leading to greater political and social visibility for transgender people.