Kepler's third law of motion relates to the relationship between the orbital period of a planet and its distance from the Sun. Specifically, it states that the square of the orbital period (T) of a planet is directly proportional to the cube of the semi-major axis (a) of its orbit.
Therefore, the correct variables involved in understanding Kepler's third law are:
orbital period (period of revolution) and distance to the sun (semi-major axis).
Since none of the provided answers directly mention "semi-major axis," the closest relevant response that pertains to these concepts would be the one that reflects the orbital period and distance:
- period of revolution, distance to sun (not listed but implied)
However, based on your options given, the correct variables would best relate to:
period of revolution, distance to sun.
Among the choices provided, there isn't a perfect match, but you can choose "period of revolution" in the context of the relation involving distance (if reflected in wording).