The elevation of Lake Ontario is 75.00\:m and the elevation of Lake Erie is 174.28\:m. A ship travels between the two lakes, passing through the locks of the Welland Canal. If the ship takes 8 hours to travel between the lakes, the average (mean) change in elevation per hour is
Answer Choices
A. 12.41\:m
B. 21.79\:m
C. 5.25\:m
D. 4.14\:m
E. 7.80\:m