The correct answer is Adverb clause. Hope this helps you.
This was really great so far! Although there is a typo. (I about 15 or so.).
B. Members of all social classes saw plays.
Elizabethan drama was not during the same time period as tv, radio, or movies. This eliminates options A and D immediately. Option B and C contradict each other. In Elizabethan drama all social classes saw plays. The wealthy people would have seats in balconies. The lower class would stand on the floor right in front of the stage.
C, the secondary definition
d. Empiricism
As empiricism is basically an experience derived from senses. So here through the text we can see that empiricism is very evident.