What changed Newton's original work on the movement of the Moon around the Earth into the law of universal gravitation?

Question

1) his conclusion that the same laws applied to all objects, no matter how small

2) his connection of gravitation to his first law

3) his connection of gravitation to Kepler's observations of planetary movement

4) his conclusion that planets move in elliptical orbits around the Sun

5) his conclusion that the same laws applied to all heavenly bodies, not just the Earth and the Moon