The answer is c because you can use your eyes
C. Low
The data sets barely overlap at all except on two occurrences.
First you want to organize the numbers in order to find the median so it should look like this: 14, 28, 42, 56. Then you want to find the one in the middle. But oh wait there are TWO in the middle so add 42 and 28 up 70 then divide it by 2 which equals your median of 35.
B. Shows the problem in synthetic division