Kepler's Laws Can Give Us the Relative Distance of Objects

Kepler's Laws can give us the relative distance of objects in the solar system. To convert these relative distances into actual distances, we need to:

A) measure the mass of the Sun
B) measure the size of the Earth
C) measure the distance directly to any object orbiting the Sun
D) measure the length of the year exactly
E) measure the exact time it takes for the Earth to spin once on its axis