The correct option is D Assert the value of a particular approach to an issue
In passage 1 the narrator says that she took up the socio-linguistic approach to recognizing gender differences because in the United States, boys and girls grow up in what are essentially different cultures, so that talk between women and men is cross-cultural communication. Thus, she asserts the importance of the approach to the gender issue. Hence, Option D is correct. The rest of the options are neither mentioned nor implied by the passage, and hence these options are incorrect.