Below average.
The root word "sub-" means under/below
The root word "-par" means average
"subpar" = below average
D, because the other options are constant change.
What type of assignment is it? If it's an informational essay, you may want to tone down the emotion. If you are trying to write something creative, I like this, but you should probably use less exclamation points. Can you elaborate a bit on what type of assignment this is? I'd be able to give better feedback that way.