The correct answer is:
A. Objects with the most mass
Gravitational force is determined by Newton's law of universal gravitation, which states that the force of gravity between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers. Therefore, objects with greater mass will exert a stronger gravitational force on one another. Meanwhile, objects that are further away from each other (option B) will experience a weaker gravitational force, and objects with the least amount of mass (option C) will exert the weakest gravitational force.