Grading by hand... slowly

I have been regrading one of the questions that many of you had though not all of you. It was about longitudinal wave, and Webcourses2 blooped up the options, so that, e.g., "all of the above" was option A. What a blooper. Very confusing.

So I have to go through and grade it by hand. Your grade will not go down, but it might stay the same or go up by 1 point.