A student pushes a toy car across the floor. If the student applies a constant force to the car, but the car begins to accelerate more rapidly, what must have happened?

✓ Correct Answer: Option B

According to Newton's Second Law (F=ma), if the applied force (F) is constant and acceleration (a) increases, the mass (m) of the object must have decreased. Options A and C would decrease acceleration, and D contradicts the 'constant force' premise.