Point A is shown on the the number line below.(The picture I attached) Another point, B , is to be placed on the number line and will be 2 1/2 unit from point A. What could be the position of point b?

(A) - 1 1/2
(B) -1
(C) 2 1/2
(D) 3 1/2
(D)

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?