The author most probably mentions academics and sanitation workers in order to
Well done!
[[snippet]]The words For Instance indicate that the rest of the sentence is an example of the situation described in the previous sentences, i.e. Structural Unemployment.
Incorrect.
[[snippet]]Academics and sanitation workers are mentioned in reference to a single type of unemployment: Structural Unemployment.
Incorrect.
[[snippet]]The last sentence of the paragraph uses a reference to academics to provide an example of another topic, not to make a point about being an academic.
Incorrect.
[[snippet]]The author does not claim that sanitation workers are always in demand. He or she describes a specific hypothetical situation in which they are in demand.
Incorrect.
[[snippet]]The words For instance tell us that the author mentions academics and sanitation workers to provide an example of another topic, not to make a point about academics or sanitation workers themselves.