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Which does not represent a constant rate of change of 70 miles per hour for a car?

A-d=70t, where d represent distance in miles and t represent time in hours

B-the car travels 140 miles in 2 hours

C-d=70t, where d represents distance in kilometers and t represents time in answers

D-the car travels 245 miles in 3.5 hours

HURRY !!!!