Which Is the Best Standard-Form Representation of the Following Argument

Which is the best standard-form representation of the following Argument from Principle?
It was completely wrong of your chemistry professor to fail you just because you didn't turn in any of the work. She knows you need that class to graduate.

A) 1) It was completely wrong of your chemistry professor to fail you.
2) You needed that class to graduate.
So, your chemistry professor shouldn't have failed you just because you didn't turn in any of the work.
B) 1) You need your chemistry class to graduate.
2) Your chemistry professor knows this. So, she shouldn't fail you.
C) 1) Your chemistry professor knows you needed her class to graduate.
2) If she fails you, you won't graduate.
So, it was wrong for your chemistry professor to fail you.
D) 1) If a student needs a class to graduate, it's wrong for a professor to fail them.
2) You needed your chemistry class to graduate.
So, it was wrong of your chemistry professor to fail you.