Final answer:
The object with the largest mass has the largest gravitational force.
Step-by-step explanation:
The gravitational force between two objects depends on the mass of each object. According to Newton's law of universal gravitation, the force of attraction between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
Applying this concept, the object with the largest mass will have the largest gravitational force. In this case, option C) 100kg has the largest mass, so it has the largest gravitational force.