Final answer:
Pushing a full grocery cart requires more force than pushing an empty cart. This represents Newton's 2nd Law of Motion.
Step-by-step explanation:
The correct answer is Law B. Newton's 2nd Law. According to Newton's second law of motion, the force acting on an object is directly proportional to its mass and acceleration. In this case, pushing a full grocery cart requires more force because the cart's mass is greater compared to an empty cart. The greater mass requires a larger force to accelerate the cart or keep it moving at a constant speed.