Answer the question

In the 1500s, Nicolaus Copernicus proposed a new theory on the heliocentric structure of the solar system. Which of these statements best describes this new theory?
Pick your answer from:
(a). Earth is at the center of the solar system.;
(b). There are eight planets in the solar system.;
(c). The Sun is at the center of the solar system.;
(d). Moons have circular orbits in the solar system.;
(c).