Select the statement which is true about the functions over the interval [1, 2]. A. Function 2 has the lowest average rate of change. B. Function 2 and function 3 have the same average rate of change. C. Function 3 has the highest average rate of change. D. Function 1 and function 3 have the same average rate of change.

Answer asap and if you do you will get brainliest. catherine buys a gallon of ice cream from the store. after taking it home, she eats a fifth of a gallon of ice cream. her sister eats some of the ice cream as well. if two-thirds of the original amount of ice cream is left, then what fraction of a gallon of ice cream did her sister eat?