The Prioress is foolishly sentimental, "She was so charitable and pitous / She wolde wepe, if that she saugh a mous /Knaught in a trappe." But all her sentiments are for animals only, she don?t cares for men as ordered by the God and Charist, The Wife of Bath is more lively, she can sit with other men and can talk and laugh, she cares only for herself.
So the answer is C
I Believe Its romance , comtemporary
Assuming that you mean physical letters that you are supposed to write, a formal letter would have formal sentences and references. ( No friendly and personal acronyms, EX: OMG) Formal sentences would include more efficient and complex words.