She is fearful of them. i think thats the answer
When we say postcolonial, this refers to the time after countries have been colonized by the Europeans and during this time, the essential topic for postcolonial writers was about homogeneity. Homogeneity is being promoted at this time because of the unfair treatment against the colonizers. Answer would be option B.
No they aren't proper to use in writing class they are considered slang. It would show your teacher that your not interested in sounding educated and proper.
Hope this helps!