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The gravitational attraction between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
Using this formula, the gravitational attraction is the greatest between the small pot (1200 grams) and the book (860 grams) because they have the highest total mass (1200 grams * 860 grams = 1,032,000 grams^2) out of all the options given, and they are placed 1 meter apart.
Therefore, the answer is:
d. between the small pot and the book