Final answer:
Gender identity is not an imitation or copy of gender, but rather a cultural identity that individuals perform according to Judith Butler.
Step-by-step explanation:
In her book Gender Trouble, Judith Butler argues that gender is not an imitation or copy, but rather a cultural identity that individuals perform. Butler suggests that gender is an impersonation of an ideal that nobody actually embodies. Based on this understanding, the correct answer to the question is B. Identity. Gender identity refers to an individual's deeply held internal perception of their gender, which may not necessarily align with their assigned sex at birth.