Which text argues that, as infants, human beings begin to define their identities against the identities of others ?

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Which text argues that, as infants, human beings begin to define their identities against the identities of others ?

A. Judith Butler’s Gender Trouble
B. W.E.B. Du Bois’s The Souls of Black Folk
C. Roland Barthes’s “The Death of the Author”
D. Jacques Lacan’s “The Mirror Stage . . . “