Bury it. think of it as a rock in a pool. you are submerging the rock into the water, meaning to make it go under, meaning bury
A i'm pretty sure it sounds the most right but it may be B
False, you can also write a fictional essay that does not have factual information.
Given that 'blunt' means 'not smart' and that 'mettle' means 'wit; intelligence', I believe that the statement that best paraphrases "What a blunt fellow is this grown to be! He was quick mettle when he went to school" is "This man, who was smart in school, has grown up to be unintelligent".