Based on your description of the graph titled "Speed of Bus," the suitable choices for each section would likely be as follows:
In section A, speed is increasing as time is increasing.
In section B, speed is decreasing as time is increasing.
In section C, speed is increasing as time is increasing.
In section D, speed is decreasing as time is increasing.
This reflects the changes in speed you described: increasing to a peak, decreasing, then increasing again, followed by a slight decrease.