Here’s the correct categorization of each item into "geocentric model" and "heliocentric model":
Geocentric Model:
- a. earth is at the center of the solar system
- b. the orbits of the planets are circular
- e. includes five planets (referring to the classical planets known in ancient times)
Heliocentric Model:
- c. includes eight planets
- d. the sun is at the center of the solar system
- D. the orbits of the planets are elliptical
(Note: Option "D" should be in lower case as 'd' to maintain consistency in formatting, but it is the same item.)