So you could take and do each number to the third power until you get approximately 124.75.
Starting with A. it would be 4x4x4 = 64 - So it can't be A.
Now, B. it would be 5x5x5 = 125 - This would be your answer since the other numbers just get bigger and stray farther and farther away from 124. Hope this helps :)
Your thoughts are correct; Ned loses 14 points overall.
The reason the correctly answered questions do not factor into the answer is because that is not what the question is asking. Correct answers are not even mentioned :)