Final answer:
The ball accelerates in the vertical direction because of gravitational force, but its motion remains constant in the horizontal direction because no force acts on it in that direction.
Step-by-step explanation:
The correct statement is B) The ball accelerates in the vertical direction because of gravitational force, but its motion remains constant in the horizontal direction because no force acts on it in that direction.
Gravity causes objects to accelerate vertically towards the center of the Earth. Therefore, the ball will accelerate in the vertical direction due to the gravitational force acting on it. However, there are no additional forces acting on the ball in the horizontal direction once it leaves Julissa's hand. This means that its motion remains constant in that direction.