Answer: Opinion
Explanation:
The phrase “blowing the cobwebs away from the stodgy Spanish art and society” implies that Spanish art and society had become so dull with no development or movement such that metaphorically speaking, cobwebs had formed on them.
This is the opinion of the author because they have judged Spanish art and society to be boring by their own standards. It therefore is not necessarily a fact and neither does it constitute either evidence or data.