(d) Feminists
A Feminist is a woman or man who believes in equal rights and opportunities for women and men, and advocates for their social, political and economic equality.
The textbook explicitly defines Feminist as "a woman or a man who believes in equal rights and opportunities for women and men." Patriarchy means rule/dominance by men; Matriarchy means rule by women; Socialist refers to an economic ideology. Only 'Feminist' matches the advocacy for gender equality described in the question.