Hey There,
Your answer is option D) The student, although not feeling well, still came in to take the test.
There is a comma after student and a comma after the word "well." You want to stop and acknowledge the student, therefore we put a comma after student. We also want to acknowledge she is not feeling well, so we put a comma there. We notice the student, that she is not feeling well, and then we continue.
Best Of Luck,
- I.A. -