The correct statement about the student's observation is:
The student observes a negative correlation between the mass and acceleration of the bowling balls.
According to Newton's second law of motion (F = ma), if a constant force is applied, then the acceleration of an object is inversely proportional to its mass. Therefore, as the mass of the bowling balls increases, the acceleration decreases. Since the lightest ball has the greatest acceleration, this observation supports the idea that there is a negative correlation between mass and acceleration.