What Was the MOST Important Contribution of Newton to the Development

Multiple Choice

What was the MOST important contribution of Newton to the development of astronomy?

A) Newton showed that astronomical phenomena can be explained using only basic physics and mathematics.
B) Newton showed that planetary orbits are ellipses, with each planet moving fastest when closest to the Sun.
C) Newton was the first person to observe the sky through a telescope.
D) Newton invented the reflecting telescope.