Which is the best example of an in-group-out-group gender schema?

Name: Which is the best example of an in-group-out-group gender schema?
Brand: Quizplus
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Question

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In-group-out-group gender schemas involve beliefs that differentiate what is appropriate or expected behavior for members of one's own gender (in-group) versus another gender (out-group). Choice C, "Boys can fight, but girls should play nice," directly contrasts expectations for boys versus girls, making it a clear example of an in-group-out-group gender schema.

Which Is the Best Example of an In-Group-Out-Group Gender Schema