Answer:
The excerpt gives an example of the following:
C) irony.
Step-by-step explanation:
After describing a whole lot of problems concerning creative block, which clearly affect the speaker (we can tell by the way those problems are described), the excerpt ends with: "I am glad my case is not serious!". That is pure irony, which is a rhetorical device used when one says something in a way that shows what was actually meant to be said was the exact opposite.