I believe the correct answer is D. humorous and informal.
You can see in the excerpt that the narrator is talking about him/herself in a humorous manner by mentioning his/her eccentricities such as 'mismatched socks' etc. The tone is very light and funny, so A, B, and C would be incorrect answers.
The Tabard Inn is the starting point for the pilgrims' journey to Canterbury. ... There is at least one more reason for having the pilgrims gather in the Tabard Inn, though: an inn could easily be a gathering place for people from diverse walks of life, accommodating commoners and more elite members of society.
Answer:
Everyone in the class <u>opens</u> a new computer file.