Final answer:
The weight of a satellite is determined by the gravitational force between the satellite and Earth, which is affected by the satellite's distance from Earth and the mass of the Earth.
Step-by-step explanation:
The weight of a satellite of Earth is determined by the gravitational force exerted on it by the Earth. According to Newton's law of universal gravitation, the force is directly proportional to the product of the masses (the mass of the satellite and the mass of the Earth), and inversely proportional to the square of the distance between their centers. In this question's context, the weight of a 100kg satellite is specifically affected by the mass of the Earth (C) and its distance from Earth, but since the mass of Earth is constant, the dominant variable that will affect the weight of the satellite is its distance from Earth. Factors such as the satellite's speed of rotation (A), its distance from the sun (B), and distance from the moon (D) would influence other aspects of the satellite's behavior, not its weight.