The correct answer is D) “Code switching”
Code switching is the process by which someone changes his/her language, dialect or register based on the context or setting. In this case for example, the student is adapting her register when speaking to the professor as the social context is different. When talking to her friend she uses an informal register and when speaking to the teacher she uses an informal register.
The abstract and concrete language options are not related to the change of language or register so they do not apply to the example. As regards polarization, it occurs when two or more groups are divided for having contrasting ideas.
Inauguration is when you are sworn in as president
Social Darwinism is the term given to various theories of society which rise in the North America, Western Europe and United Kingdom during 1870s. The theories are applied to natural selection and survival of the fittest.
