Which of the following answers describes kepler's laws?
a. planets orbit in elliptical patterns; the bigger the planet, the more gravitational pull; a planet's gravitational pull is stronger or weaker depending on its distance from the sun.
b. a planet's orbit covers equal distances in equal amounts of time; the speed of a planet's orbit depends on its distance from the sun; the bigger the planet, the slower it moves.
c. planets orbit in elliptical patterns; a planet's orbit covers equal areas in equal amounts of time; planets' orbits are shorter or longer depending on their distance from the sun.