Step 1: Understanding Queer Theory.
Queer Theory challenges conventional categories of gender and sexuality, emphasizing fluidity, ambiguity, and the multiplicity of identities. It critiques the binaries of male/female, gay/straight, and other traditional social categories. Queer theorists also seek to create a more inclusive public that acknowledges and celebrates diverse sexual and gender identities.
Step 2: Explanation of the options.
(A) is incorrect because queer theory critiques the binary opposition of male and female and does not treat sexuality as fixed or disengaged from gender.
(B) is correct because queer theory does rely on postmodern concepts such as gender ambiguity, fluidity, and multiple identities.
(C) is correct because queer theorists have been active in creating a more inclusive public that embraces various sexual identities, including gays, lesbians, bisexuals, and transgender people.
(D) is correct because the term ‘queer’ is used by queer theorists for its shock value, playfulness, and ability to recontextualize and disrupt traditional norms around sexuality.
Final Answer: Option \( \boxed{(B),\ (C),\ (D)} \) is correct.