Astock person at the local grocery store has a job consisting of the following five segments:

1) picking up boxes of tomatoes from the stockroom floor

2)accelerating to a comfortable speed.

3) carring the boxes to the tomato display at constant speed.

4)decelerating to a stop.

5) lowering the boxes slowly to the floor.

during which of the five segments of the job does the stock person do positive work on the boxes?

a) (2) and (3)

b(1) and (2)

c) (1) only

d) (1), (2), (4) and (5)

e) (1) and (5)