A bus leaves a bus station and picks up two people at the first stop . At the second stop , the bus picks up three more people .
At the third stop, all of the passengers get off the bus . Emma sketched the graph below to represent the situation. What error did emma make in her sketch ?
A) her sketch should not include horizontal lines
B) her sketch should have curves instead of lines .
C) her sketch does not show the correct number of stops .
D) her sketch shows the number of people decreasing and then increasing.