Concept:A theme is the central idea or dominant message that a writer conveys through a literary extract.
Explanation:The attitude and treatment described in the extract reflect racial prejudice.
A character is judged or mistreated purely because of race, not personal merit.
This kind of bias points directly to racism as the central theme.
It is not best explained by callousness, because the specific cause is race-based.
It is not hypocrisy, since no false display of moral virtue appears.
It is also not tribalism, because the discrimination is not tied to ethnic-group loyalty.
Therefore, among the given options, racism is the correct theme.
Answer:C. racism