Final answer:
The terms 'promdi' and 'barriotic' are disparaging expressions used to refer to students from rural areas, often pointing out their differences from mainstream urban culture in a negative light.
Step-by-step explanation:
The school campus expressions "promdi" and "barriotic" are indicative of C) Disparaging terms for students from rural areas. These expressions are often used to describe someone perceived as unsophisticated or not fitting into the mainstream urban culture, usually because they come from a rural place or are newcomers to city life. The use of such terms highlights a form of bias that can be prevalent in school settings, reflecting a negative view on students' backgrounds rather than celebrating diversity and the richness that different cultures bring to the educational environment. They indicate a bias or snobbery towards urban culture and a lack of understanding or appreciation for rural traditions and customs.