What is the biggest diffence between the geocentric and heliocentric models of our solar system?

According to geocentric Earth is the center of universe, and everything revolves around it, while according the heliocentric model sun is the center of universe and everything revolves around the sun.

Explanation:

Geocentric model was mostly used during the medieval period because the theory was supported by the church. Although ancient Greek philosophers already presented heliocentric theory, it was not until the period of Copernicus and Galilei this theory was widely accepted.

b is the right answer for this question.