Answer:
The correct answer is b) Binary understandings of gender are being increasingly challenged by young people, who are creatively reconstructing traditional gender meanings.
Explanation:
While it cannot be said that the concepts of male and female have entirely lost validity in the United States--and indeed it is unclear when or if this will ever happen--, it is true that younger generations of Americans are increasingly questioning their relevance and applicability to their own personal identities. To a large degree, this stems from decades of feminist and queer activism striving to break down oppressive and damaging notions of gender and all of their day-to-day implications for gender roles, familial relationships, workplace relationships, professional development, government policy, education and so on.
Though it is true that some scientists are even beginning to challenge the notion of biological sex as a binary choice between male and female, and instead proposing to see it as a spectrum, this idea has not yet gained sufficient acceptance in the scientific community to explain the widespread interest in concepts like genderqueerness among younger Americans.
Finally, there is no indication that this newfound openness around topics of gender and sexuality has caused identity crises among American youth, nor can it be said that US policy has caused Americans' gender to become "deregulated".
For these reasons, the correct answer is b).
