Gravitational attraction is determined by the masses of the objects and the distance between them. Generally, larger masses will exert a greater gravitational force on each other, regardless of their distance, as described by Newton's law of universal gravitation.
Assuming the book, cereal box, small pot, penny, and paper clip are all common household items with distinctly different masses, the object pair with the greatest mass difference will likely result in the greatest gravitational attraction.
Without knowing the exact masses of each object, a logical assumption would be that the "small pot" (which is likely heavier than the other items) and the "book" would exert the greatest gravitational attraction compared to the other pairs listed.
Thus, the answer is:
between the small pot and the book.