One of the Major Contributions of Galileo Galilei to the Development

Multiple Choice

One of the major contributions of Galileo Galilei to the development of modern astronomy was

A) use of parallax to prove that Earth moves around the Sun.
B) proof that planetary orbits are ellipses.
C) development of the first mathematical heliocentric model of the solar system.
D) discovery of the satellites (moons) of Jupiter.