For the first question, the answer is A. archaic language.
The author Shelley was a very romantic poet. In that time, the poets used a jargon different from the one we use nowadays and it is because language always is in constant change by many factors such as culture, technology, etc.
For the second question, the answer is B. "...An' weary winter comin' fast,/An cozy here, beneath the blast..."
In this excerpt, empathy is shown because it is describing the hard winter that is passing.