Which of the Following Is an Example of Code Switching

Which of the following is an example of code switching?

A) a person who is able to switch back and forth between different gender identities
B) a rapid shift in cultural or moral norms, such as changes in views toward same-sex relationships among people in the United States
C) Black college students switching between standard English and vernacular Black English to emphasize credibility in the classroom and Black identity respectively
D) someone who has lived in multiple cultures throughout his or her life and maintains separate cognitive schemas for each