* Gravity and Mass: The force of gravity between two objects depends on their masses. The more massive an object, the stronger its gravitational pull.

Let's compare the options:

* A large book: Relatively light.

* B house: Heavier than a book, but still relatively light compared to the others.

* C human being: Lighter than a car.

* D an average size car: The heaviest of the options.

Therefore, the answer is D, an average-size car. It has the greatest mass of the options, and therefore the strongest gravitational pull on Earth at its surface.

Important Note: While the car has the strongest pull *compared to the other options*, it's still an incredibly tiny force compared to the Earth's own gravity. We don't notice these small gravitational forces in our daily lives.