Which model places the Sun at the center of the solar system with planets orbiting around it?

• A. Geocentric model
• B. Moon-centered model
• C. Heliocentric model
• D. Celestial sphere model

Answer: (C)

Heliocentric arrangement: the Sun sits at the center of the solar system and the planets orbit around it. This view matches how planetary motions work and explains why planets appear to move in the sky in ways that are simplest when the Sun is at the center. Historically, it replaced the older idea that Earth was the center of everything. The Moon-centered model would place the Moon at the center or imply orbits around Earth, not around the Sun. The celestial sphere model treats the sky as a set of surrounding spheres with stars fixed on them, not a physical system of planet orbits around the Sun.