Answer:
The range is the difference between the greatest and least values in a set of data.
For Contest 1, the greatest kite height is 170 feet and the least kite height is 112 feet, so the range is:
170 - 112 = 58 feet
For Contest 2, the greatest kite height is 160 feet and the least kite height is 85 feet, so the range is:
160 - 85 = 75 feet
The difference between the ranges is:
75 - 58 = 17 feet
Therefore, the answer is B. 17.