Final answer:
The dive bomber is moving horizontally to the left side of the coordinate system.
Step-by-step explanation:
The dive bomber is traveling from right to left along the function y = x². In the coordinate system, the x-axis represents the horizontal direction and the y-axis represents the vertical direction. Since the bomber is moving from right to left, it is moving horizontally to the left side of the coordinate system. Therefore, the answer is d) Horizontally to the left side of the coordinate system.