The following tables represents the number of weeks and pounds (lbs) of weight loss for Cindy and Mark. What is the average rate of change for Cindy and Mark?

Cindy:
Time (Weeks): 0 1 2 3 4 5
Weight (lbs): 143 138 135 135 133 130.5

Mark:
Time (Weeks): 0 1 2 3 4 5
Weight (lbs): 245 240 237 232 226 220

A. Cindy = 2.5lb loss a week; Mark = 5lb loss a week.
B. Cindy = 3lb loss a week; Mark = 5.25lb loss a week.
C. Cindy = 5lb loss a week; Mark = 2.5lb loss a week.
D. Cindy = 5.25lb loss a week; Mark = 3lb loss a week.