12. Which of the following phrases describes the motion of the bus from O to A?

Answer:
Fast, constant, and positive direction
Explanation:
From O to A, there is a straight line in the graph. It means that the distance is increasing when time is increasing. So, the bus is moving in the positive direction and it is fast. Finally, it is constant because the graph is a straight line.
Therefore, the answer is:
Fast, constant, and positive direction.